[Footnotes]

[Footnotes]
1
K. Darrow, "Data and nature of cosmic rays," Bell system technical journal, 11 (1932), 148-184, on 148.
C. S. Gillmor, "The early history of upper atmospheric physics research in Antarctica," in L. J. Lanzerotti and C. G. Park, eds., Upper atmosphere research in Antarctica (Washington, D.C., 1978), 236-262.
2
C. D. Anderson and S. Neddermeyer, "Cloud chamber observations of cosmic rays at 4300 meters elevation and near sea-level," PR, 50 (1936), 263-271.
3
M. Schein, W. P. Jesse, and E. O. Wollan, "The nature of the primary cosmic radiation and the origin of the mesotron," PR, 59 (1941), 615
J. J. Lord, J. Fainberg, and M. Schein, "Evidence for the multiple production of mesons in a single nucleon- nucleon collision," PR, 80 (1950), 970-973.
4
S. Weinberg, "The search for unity: Notes for a history of quantum field theory," Daedalus, 106:4(1911), 17-35, on 18.
5
J. R. Oppenheimer, "Thirty years of mesons," Physics today, 19:11 (1966), 51-58, on 58.
C. M. G. Lattes et al., "Processes involving charged mesons," Nature, 159 (1947), 694-697
"Observations of the tracks of slow mesons in photographic emulsions," ibid., 160 (1947), 453-456 and 486-492.
6
W. Heisenberg and W. Pauli, "Zur Quantendynamik der Wellenfelder," ZP, 56 (1929), 1-61, and 59 (1930), 168-190.
7
E. Fermi, "Quantum theory of radiation," RMP, 4 (1932), 87-132. For a modern treatment see J. J. Sakurai, Advanced quantum mechanics, (Reading, Mass., 1967).
8
Pauli to O. Klein, 18 Feb 1929, in Pauli, Wissenschaftlicher Briejwechsel, I: 1919-1929 A. Hermann et al., eds. (New York, 1979), 488-492.
9
Heisenberg and Pauli (ref. 6), 49-54.
10
F. Rohrlich, Classical charged particles (Reading, Mass., 1965), 125.
12
N. Bohr, "Atomic stability and conservation laws," in Convegno di fisica nucleare (Rome, 1932), 119-130
"Chemistry and the quantum theory of atomic constitution," Journal of the chemical society, 1932, 349-384 (expanded Faraday lecture, May 1932).
13
W. Heitler, The quantum theory of radiation, 1st ed. (Oxford, 1936), 91-102 (pre- face dated Nov 1935).
J. R. Oppenheimer, "Are the formulae for the absorption of high energy radiations valid?" PR, 47(1935), 44-52, on 47.
14
Heitler (ref. 13), 93-94.
15
Heitler, The quantum theory of radiation, 2nd ed. (London, 1944), 93-94 and 237.
16
J. F. Carlson and J. R. Oppenheimer, "On the range of fast electrons and neu- trons," PR, 38 (1931), 1787-1788.
17
J. F. Carlson and J, R. Oppenheimer, "The impacts of fast electrons and mag- netic neutrons," PR, 41 (1932), 763-792, on 765.
18
Heisenberg to Bohr, 10 Mar 1930 (BSC 20, 2)
Heisenberg, "Die Selbstenergie des Elektrons," ZP, 65 (1930), 4-13
Joan Bromberg, "The impact of the neutron: Bohr and Heisenberg," HSPS, 3 (1971), 307-341, on 323-327.
19
Pauli to Klein, 18 Feb 1929, in Pauli (ref. 8), 491
Bohr to Dirac, 29 Aug 1930 (BSC 18, 4).
20
Heisenberg to Bohr, 27 Jul (1931) (BSC 20, 2) and 20 Jun (1932) (BSC 20, 2).
21
Heisenberg, "Theoretische Uberlegungen zur Hohenstrahlung," Annalen der Physik, 13 (1932), 430-452
Bloch to Bohr, 14 May 1932 (BSC 17, 2).
22
P. M. S. Blackett and G. Occhialini, "Some photographs of the tracks of penetrating radiation," PRS, 139 (1933), 699-727
D. Skobelzyn, "Uber eine neue Art sehr schneller 0-Strahlen," ZP, 54 (1929), 686-702
23
P. A. M. Dirac, "A theory of electrons and protons," PRS, 126 (1930), 360-365
Joan Bromberg, "The concept of particle creation before and after quantum mechanics," HSPS, 7(1976), 161-191.
24
Dirac, "Theorie du Positron," in Structure et propri'et'es des noyaux atomiques (Con- seil International de Physique Solvay, VII, rapports et discussions) (Paris, 1934), 203-212
Heisenberg to Sommerfeld, 9 Oct 1933 (AHQP 83, H).
25
Pauli to Heisenberg, 14 Jun 1934 (PLC), and remarks in ref. 24, 213-214.
26
Pauli and V. F. Weisskopf, "Ober die Quantisierung der skalaren relativistischen Wellengleichung," Helvetica physica acta, 7 (1934), 709-731
Heisenberg, "Bemerkungen zur Diracschen Theorie des Positrons," ZP, 90 (1934), 209-231.
27
Pauli to Kronig, 20 Nov 1935 (PLC).
Compare Pauli to Kronig, 21 May 1925, in Pauli (ref. 8), 216
J. R. Oppenheimer to F. Oppenheimer, 4 Jun (1934)
A. K. Smith and C. Weiner, eds., Robert Oppenheimer letters and recollections (Cambridge, Mass., 1980), 181.
28
Heisenberg to Pauli, 29 Apr 1935 (AHQP 80)
Pauli to Heisenberg, 15 Jun 1935 (PLC)
Bohr to Heisenberg, 22 May 1935 (BSC 20, 2).
29
O. Halpern, "Scattering processes produced by electrons in negative energy states," PR, 44 (1933), 855-856
H. Euler and B. Kockel, "Ober die Streuung von Licht an Licht nach der Diracschen Theorie," Nwn, 23 (1935), 246-247.
30
Heisenberg and H. Euler, "Folgerungen aus der Diracschen Theorie des Posi- trons," ZP, 98 (1936), 714-732 (received 22 Dec 1935).
E. A. Uehling, "Polarization effects in the positron theory," PR, 48 (1935), 55- 63.
31
M. Born and L. Infeld, "Foundations of the new field theory," PRS, 144 (1934), 425-451
32
Bohr to E. J. Williams, 16 Mar 1935 (BSC 26, 4)
Heisenberg to Born, 18 Mar 1935 (BN):
33
Heisenberg and Euler (ref. 30), 732.
34
Blackett and Occhialini (ref. 22), 713ff.
35
W. Furry and J. R. Oppenheimer, "On the theory of the electron and [!] posi- tive," PR, 45 (1934), 245-262
H. A. Bethe and W. Heitler, "On the stopping of fast parti- cles and on the creation of positive electrons," PRS, 146 (1934), 83-112.
36
J. R. Oppenheimer and M. S. Plesset, "On the production of the positive elec- trons," PR, 44(1933), 53-55.
37
Furry and Oppenheimer (ref. 35), 245.
38
Ibid., 260.
J. R. Oppenheimer, "Electron theory," Conseil International de Physique Solvay, Rapports (Paris, 1950), 1-11, on 3.
39
Bethe and Heitler (ref. 35), 103
C. D. Anderson, "Cosmic-ray positive and negative electrons," PR, 44 (1933), 406-416.
40
Heitler and F. Sauter, "Stopping of fast particles with emission of radiation and the birth of positive electons," Nature, 132 (1933), 892
B. Rossi, "Absorptionsmessungen der durchdringenden Korpuskularstrahlung in einem Meter Blei," Nwn, 20 (1932), 65.
41
E. J. Williams, "Nature of the high energy particles of penetrating radiation and status of ionization and radiation formulae," PR, 45 (1934), 729-730.
C. G. Montgomery, D. D. Montgomery, W. E. Ramsey, and W. F. G. Swann, "A search for protons in the cosmic-ray beam," PR, 50 (1936), 403-407.
42
Bethe and Heitler (ref. 35), 112, 104.
43
C. D. Anderson and S. Neddermeyer, "Fundamental processes in the absorption of cosmic-ray electrons and protons," in International Conference on Physics, London, Papers and discussions, I: Nuclear physics (Cambridge, 1935), 171-187.
44
Heitler (ref. 13), x, 228.
45
Blackett, "The absorption of cosmic rays," in Conference, (ref. 43), 199-205, on 199
Anderson to Bethe, 7 Jun 1935 (BP 3).
Anderson referred to data in Neddermeyer and Anderson, "Absorption of electrons," PR, 48 (1935), 486 (abstract of paper, Jun 1935)
Anderson and Neddermeyer (ref. 43), 181n.
46
B. Rossi, "Some results arising from the study of cosmic rays," in Conference (ref. 43), 233-247
P. Auger and L. Leprince-Ringuet, "Analyse du rayonnement cosmique en haute altitude," Academie des Sciences, Paris, Comptes rendus, 199 (1934), 785-787
Auger to Bohr, 24 Mar (1935) (BSC 17, 1).
47
R. A. Millikan, Cosmic rays (New York, 1939), 36.
48
Oppenheimer and Plesset (ref. 36); W. Heitler, "Doer die bei sehr schnellen Stossen emittierte Strahlung," ZP, 84 (1933), 145-167.
Heitler to Bohr, 16 Oct 1933 (BSC 20, 3).
49
Williams, "Applications of the method of impact parameter in collisions," PRS, 139 (1933), 163-186.
Heitler (ref. 48), 164-167
50
Williams (ref. 41)
von Weizsacker, "Ausstrahlung bei Stossen sehr schneller Elektronen," ZP, 88 (1934), 612-625
L. D. Landau, "On the theory of the slow- ing down of fast electrons by radiation," Physikalische Zeitschrift der Sowjetunion, 5 (1934), 761-764
D. Ter Haar, ed., Collected papers of L. D. Landau (Oxford, 1965), 80-83.
51
Weizsacker (ref. 50), 622.
53
Bethe to Bohr, 30 May 1934 (BSC 17, 1).
54
V. F. Weisskopf, "My life as a physicist," in Weisskopf, Physics in the twentieth century: Selected essays (Cam- bridge, Mass., 1972), 1-21, on 12-13.
55
Oppenheimer (ref. 13), 47.
56
L. W. Nordheim, "Probability of radiative processes of very high energies," PR, 49 (1936), 189-191.
57
Nordheim to Bethe, 12 Nov 1935 (BP 3).
Bohr to Williams, 11 Feb 1935 (BSC 26, 4)
Peierls to Blackett, 14 Apr 1937 (BC).
58
H. J. Bhabha and Heitler, "The passage of fast electrons and the theory of cosmic showers," PRS, 159 (1937), 432-458, on 434
J. F. Carlson and J. R. Oppen- heimer, "On multiplicative showers," PR, 51 (1937), 220-231.
59
E. Fermi, "Versuch einer Theorie der j3-Strahlen, I," ZP, 88 (1934), 161-177.
60
Fermi to Heisenberg, 30 Jan and 6 Feb 1934 (AHQP 45, 1)
E. J. Konopinski and G. Uhlenbeck, "On the Fermi theory of radioactivity," PR, 48 (1935), 7-12 and 107- 108
G. Wentzel, "Zur Theorie der j3-Umwandlung und der Kernkrafte, I," ZP, 104 (1937), 34-47.
61
Heisenberg to Pauli, 26 May 1936 (AHQP 80)
W. Heisenberg, "Zur Theorie der 'Schauer1 in der Hohenstrahlung," ZP, 101 (1936), 533-540.
62
Heitler (ref. 13), 178-181.
63
Heisenberg (ref. 61), 536-538.
64
Ibid., 540.
65
Konopinski and Uhlenbeck (ref. 60).
Heisenberg-Meitner correspondence, Nov 1935
66
Heisenberg, "Theorie der Schauer," Angewandte Chemie, 49 (1936), 693
Heitler, "Energieverlust sehr schneller Elektronen," ibid., 690.
67
Placzek to Bethe, 9 Jul 1936 (BP 3).
Neutron capture and nuclear constitution," Nature, 137 (1936), 344-348
Bethe to Randall, 2 Jun 1936 (BP 3)
Bethe to Goudsmit, 6 Jun 1936
68
"Mit Oliphant bin ich von Kopenhagen zuruckgefahren (wo es ubrigens sehr nett war, besonders wegen Heisenbergs Schauertheorie)." Peierls to Bethe, 6 Aug 1936 (BP 3).
69
Bohr to Dirac, 2 Jul 1936 (BSC 18, 4).
Bohr to Blackett, 29 Jun 1936 (BSC 17, 3).
70
Gamow to Bethe, 20 Dec 1936 (BP 3).
71
"Report of the third Washington conference on theoretical physics," 12 Mar 1937 (BP 4).
72
Paul Ehrenfest, Jr. to Blackett, 8 Nov 1936 (BC).
73
J. K. B0ggild, Uber die sekundaren Wirkungen der Hdhenstrahlung, tr. Clara Packness (Copenhagen, 1937) (Ph.D. thesis, University of Copenhagen, May 1937).
74
Anderson to Heitler, 21 May 1936 (BP 3).
75
Anderson and Neddermeyer (ref. 2), 268.
76
J. R. Oppenheimer, "On the elementary interpretation of showers and bursts," PR, 50 (1936), 389
H. J. Bhabha and W. Heitler, "Passage of fast electrons through matter," Nature, 138 (1936), 401.
Carlson and Oppen- heimer (ref. 58), 222
Bhabha and Heitler (ref. 58), 456.
77
Bhabha and Heitler (ref. 58), 435.
78
Carlson and Oppenheimer (ref. 58), 221.
79
L. W. Nordheim, G. Nordheim, J. R. Oppenheimer, and R. Serber, "The disin- tegration of high energy protons," PR, 51 (1937), 1037-1045, on 1038.
80
Carlson and Oppenheimer (ref. 58), 221-222.
81
L. W. Nordheim to Sommerfeld, 24 Oct 1936 (AHQP 32, 9)
L. W. Nordheim and G. Nordheim, "On the interaction of heavy and light particles at very high energies," PR, 51 (1937), 379.
82
Nordheim et al. (ref. 79), 1038
W. Heisenberg, "Ober die in der Theorie der Elementarteilchen auftretende universelle Lange," Annalen der Physik, 32 (1938), 20-33, on 26-27.
83
Heisenberg to Pauli, 16 Jan and 12 Jun 1937 (AHQP 80).
84
Pauli to Heisenberg, 9 Jun and 26 Oct 1936 (PLC).
85
Heisenberg to Born, 3 Nov 1936 (BN).
86
Heisenberg to Bhabha, 21 Jan 1937 (AHQP 80).
87
Pauli to Heisenberg, 20 Nov (1936) (PLC).
88
Heisenberg to Pauli, 26 April (1937) (AHQP 80)
89
Pauli to Heisenberg, 2 May 1937 (PLC).
Heisenberg to Bohr, 5 Jul 1937 (BSC 20, 2).
90
L. Fussell, Jr., "Production and absorption of cosmic-ray showers," PR, 51 (1937), 1005-1006
W. Messerschmidt, "Untersuchungen uber Ultrastrahlungsstosse," ZP, 103 (1936), 27-56
S. Neddermeyer and C. D. Anderson, "Note on the nature of cosmic- ray particles," PR, 51 (1937), 884-886
J. C. Street and E. C. Stevenson, "Penetrating cor- puscular component of the cosmic radiation," ibid., 1005.
91
Heisenberg to Kramers, 22 May 1937 (AHQP 10, 3).
92
H. Yukawa, "On the interaction of elementary particles, I," Physico- Mathematical Society of Japan, Proceedings, 17 (1935), 48-57.
93
Pauli and Weisskopf (ref. 26).
94
Yukawa (ref. 92), 57.
95
J. R. Oppenheimer and R. Serber, "Note on the nature of cosmic-ray particles," PR, 51 (1937), 1113
R. Serber, "On the dynaton theory of nuclear forces," PR, 53 (1938), 211.
96
Vis'vapriya Mukherji, "A history of the meson theory of nuclear forces from 1935 to 1952," Archive for history of exact sciences, 13 (1974), 27-102.
97
N. Kemmer, "Quantum theory of Einstein-Bose particles and nuclear interac- tion," PRS, 166 (1938), 127-153
"The impact of Yukawa's theory on workers in Europe—a reminiscence," Progress of theoretical physics, Suppl. (extra number), 1965, 602-608.
98
H. Frohlich, Heitler, and Kemmer, "On the nuclear forces and the magnetic moments of the neutron and the proton," PRS, 166 (1938), 154-177.
99
Kemmer, "The charge-dependence of nuclear forces," Cambridge Philosophical Society, Proceedings, 34 (1938), 354-364.
100
Ref. 98, 155.
101
Bhabha, "On the theory of heavy electrons and nuclear forces," PRS, 166 (1938), 501-528, on 504
Heitler, "Showers produced by the penetrating cosmic radia- tion," ibid., 529-543.
102
Bhabha (ref. 101), 502.
103
Letter of 21 Dec 1937 (BSC 22, 1)
Bethe to Blackett, 8 Mar 1938 (BP 3).
104
Kemmer, "Quantum theory" (ref. 97), 148.
105
Ref. 98, 176, details on 169-170.
106
Heitler to Bohr, 25 Apr 1938 (BSC 20, 3).
Kemmer to Wentzel, 9 Mar 1938 (AHQP 66, 6).
107
Heitler (ref. 101), 538.
108
Ibid., 535.
109
Pauli and F. J. Belinfante, "On the statistical behaviour of known and unknown elementary particles," Physica&gt 7 (1940), 177-192
M. Fierz, "Uber die relativistische Theorie kraftefreier Teilchen mit beliebigem Spin," Helvetica physica acta, 12 (1939), 3-37
M. Fierz and Pauli, "On the relativisitic wave equations for particles of arbitrary spin in an electromagnetic field," PRS, 173 (1939), 211-232.
110
Dirac, "Relativistic wave equations," PRS, 155 (1936), 447-459, on 448.
111
W. Heisenberg, "Die Grenzen der Anwendbarkeit der bisherigen Quan- tentheorie," ZP, 110 (1938), 251-266.
112
H. Euler and Heisenberg, "Theoretische Gesichtspunkte zur Deutung der kosmischen Strahlung," Ergebnisse der exakten Naturwissenschaften, 17 (1938), 1-69
Euler, Dber die durchdringende Komponente der kosmischen Strahlung und die von ihr erzeugten HofTmannschen Stosse," ZP, 110 (1938), 692-716.
113
L. W. Nordheim and G. Nordheim, "On the production of heavy electrons," PR, 54 (1938), 254-265, on 256.
114
Letter of 3 Feb 1940 (PLC).
115
H. Geiger, "Die kosmische Ultrastrahlung als Forschungsproblem," Preussische Akademie der Wissenschaften, Vortrdge und Schriften, 3 (1940), 1-33, on 30.
116
I. S. Bowen, R. A. Millikan, H. V. Neher, "New evidence as to the nature of the incoming cosmic rays, etc.," PR, 53 (1938), 217-223
M. Schein and V. C. Wilson, "Evidence for the production of penetrating secondary cosmic-ray particles in the atmo- sphere," PR, 54 (1938), 304-305.
117
Bethe and L. W. Nordheim, "On the theory of meson decay," PR, 57 (1940), 998-1006.
118
P. Auger, R. Maze, T. Grivet-Meyer, "Grandes gerbes cosmiques atmospheriques contenant des corpuscles ultrapenetrants," Academie des Sciences, Paris, Comptes rendus, 206 (1938), 1721-1723.
Blackett to Heisenberg, 10 Sep 1938 (AHQP 45, 1)
Ehrenfest to Heisenberg and Euler, 20 Nov 1938 (ibid.).
119
A. C. B. Lovell and J. G. Wilson, "Investigation of cosmic ray showers of atmospheric origin, using two cloud chambers," Nature, 144 (1939), 863-864
C. G. Montgomery and D. D. Montgomery, "The behavior of high energy electrons in the cosmic radiation," RMP, 11 (1939), 255-265, on 257.
120
Heitler (ref. 101), 540.
121
J. G. Wilson, "Absorption of penetrating cosmic ray particles in gold," PRS, 172 (1939), 517-529, on 525
"The scattering of mesotrons in metal plates," PRS, 174 (1940), 73-85, on 84.
122
Bhabha, "The fundamental length introduced by the theory of the mesotron (meson)," Nature, 143 (1939), 276-277
Dirac, "Classical theory of radiating electrons," PRS, 167 (1938), 148-169, on 149.
23
Bhabha, "Classical theory of mesons," PRS, 172 (1939), 384-409, on 385
Bhabha to Bohr, 17 Dec 1938 (BSC 17, 2); Bhabha (ref. 122), 277.
124
Bhabha (ref. 123), 386.
125
J. R. Oppenheimer, H. Snyder, R. Serber, "The production of soft secondaries by mesotrons," PR, 57(1940), 75-81, on 75.
126
Letter of 27 Apr 1939 (PLC).
127
Heisenberg to Pauli, 19 May 1939 (AHQP 80)
W. Heisenberg, "Zur Theorie der explosionartigen Schauer in der kosmischen Strahlung, II," ZP, 113 (1939), 61-86
"On the theory of explosion showers in cosmic rays," RMP, 11 (1939), 241.
128
Heisenberg (ref. 127), 82.
129
Wilson, "Absorption" (ref. 121); Heisenberg to Pauli, 20 Apr 1939 (AHQP 80)
Kemmer to Pauli, 17 May 1939 (PLC).
130
Bhabha (ref. 123), 400-401.
131
Attributed to Bhabha by Heitler, "Scattering of mesons and the magnetic moments of proton and neutron," Nature, 145 (1940), 29-30.
132
Kemmer, "The particle aspect of meson theory," PRS, 173 (1939), 91-116
Kemmer-Pauli correspondence, 1939 (PLC).
133
Heitler and S. T. Ma, "Inner excited states of the proton and neutron," PRS, J76 (1940), 368-397, on 370
Bhabha, "General classical theory of spinning particles in a meson field," PRS, 178 (1941), 314-350, on 319.
134
Ibid., 320
Bhabha and H. C. Corben, "General classical theory of spinning par- ticles in a Maxwell field," ibid., 273-314.
135
G. Wentzel, "Zum Problem des statischen Mesonfeldes," Helvetica physica acta, 13 (1940), 269-308.
136
Bethe, "The meson theory of nuclear forces," PR, 55 (1939), 1261-1263, and 57(1940), 260-272, 390-413.
137
Bethe to Fierz, 3 Apr 1940 (BP 3).
Pauli to Oppenheimer, 13 Jan 1941, Oppenheimer papers, 234 (Library of Congress, Manuscripts Division, Wash.).
138
Schein, Jesse, and Wollan (ref. 3)
Lattes et al. (ref. 5)
Schein to Oppen- heimer, 9 Apr 1941, Oppenheimer papers (ref. 137).
139
A. M. Hillas, Cosmic Rays (Oxford, 1972), 49-51.
140
E. Teller, G. Gamow, J. A. Fleming, "The seventh annual Washington confer- ence of theoretical physics, May 22-24, 1941," Science, 94 (1941), 92-94.
141
Pauli, Meson theory of nuclear forces (New York, 1946)
J. R. Oppenheimer and J. Schwinger, "On the interaction of mesotrons and nuclei," PR, 60 (1941), 150-152, on 150-151.
142
J. R. Oppenheimer and S. A. Wouthuysen, "The multiple production of mesons," PR, 73 (1948), 127-140, on 127
E. C. Nelson and J. R. Oppenheimer, "Multiple production of mesotrons by protons," PR, 60 (1941), 159-160.
143
J. Hamilton, Heitler, H. W. Peng, "Theory of cosmic-ray mesons," PR, 64 (1943) , 78-94, on 78-79.
144
Bhabha and Harish-Chandra, "On the theory of point particles," PRS, 183 (1944) , 134-141, on 135
Bhabha and S. K. Chakrabarty, "The cascade theory with colli- sion loss," PRS, 181 (1943), 267-303, on 267.
145
Montgomery and Montgomery (ref. 119)
Oppenheimer, discussion remark, RMP, 11 (1939), 264-266
146
Heisenberg in Pauli and Heisenberg, "Bericht iiber die allgemeinen Eigenschaf- ten der Elementarteilchen," unpublished manuscript for Solvay Congress (cancelled), 1939, chapts. 3-4 (PLC; Niels Bohr Institute, Copenhagen; Max Planck-Institut, Munich).
147
Euler, "Dber die Beobachtung von Luftschauern und Kernzertummerungen der kosmischen Strahlung in der lonisationskammer," ZP, 116 (1940), 73-104.
148
Heisenberg, "Die beobachtbaren Grossen in der Theorie der Elementarteil- chen," ZP, 720 (1943), 513-538, 673-702
123 (1944), 93-112
G. F. Chew, The analytic S matrix: A basis for nuclear democracy (New York, 1966).
149
C. F. von Weizsacker, "Theorie des Mesons," in Kosmische Strahlung. Vortrdge gehalten im Max Planck-Institut, Berlin-Dahlem, ed. Heisenberg (Berlin, 1943), 115-118, on 116.
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