EINSTEIN'S COLLABORATORS 499
E42. , letter to A. Flexner, March 24, 1933.
E43. , letter to A. Flexner, April 13,1933.
E44. , letter to A. Flexner, August 4, 1933.
E45. — and W. Mayer, Ann. Math. 35, 104 (1934).
E46. P. Ehrenfest, R. C. Tolman, and B. Podolsky, Phys. Rev. 37, 602 (1931).
E47. A. Einstein, R. C. Tolman, and B. Podolsky, Phys. Rev. 37, 780 (1931).
E48. and W. de Sitter, Proc. Nat. Ac. Sn. 18, 213 (1932).
E49. , B. Podolsky, and N. Rosen, Phys. Rev. 47, 777 (1935).
E50. and N. Rosen, Phys. Rev. 48, 73 (1935).
E51. and , Phys. Rev. 49, 404 (1936).
E52. and , /. Franklin Inst. 223, 43 (1937).
E53. , letter to J. T. Tate, July 27, 1936.
E54. , Phys. Rev. 89, 321 (1953).
E55. , letter to V. Molotov, March 23, 1936.
E56. , letter to V. Molotov, July 4, 1936.
E57. in L. Infeld, The World of Modern Science, p. 5. V. Gollancz, London, 1934.
E58. —, L. Infeld, and B. Hoffmann, Ann. Math. 39, 65 (1938).
E59. and L. Infeld, Ann Math. 41, 455 (1940).
E60. and , Can J. Math. 3, 209 (1941).
E61. and —, The Evolution of Physics. Published simultaneously by Cambridge
University Press, Cambridge; Sythoff's, Amsterdam; and Simon and Schuster, New
York; 1938.
E62. , letter to L. Infeld, undated, probably April 1941.
E63. and P. Bergmann, Ann. Math. 39, 65 (1938).
E64. , V. Bargmann, and P. Bergmann in Th. von Kdrmdn Anniversary Volume,
p. 212. California Institute of Technology, Pasadena, 1941.
E65. in P. Bergmann, Introduction to the Theory of Relativity, p. v. Prentice-Hall,
New York, 1942.
E66. and V. Bargmann, Ann. Math. 45, 1 (1944).
E67. —, Ann. Math. 45, 15 (1944).
E68. , Naturw. 10, 184 (1922).
E69. and W. Pauli, Ann. Math. 44, 131 (1943).
E70. , Rev. Univ. Nac. de Tucuman, 2, 11, (1941).
E71. C. P. Enz in J. Mehra, The Physicists' Conception of Nature, p. 766. Reidel, Bos-
ton, 1973.
E72. A. Einstein and E. Straus, Rev. Mod. Phys. 17, 120 (1945); correction in 18, 148
(1946).
E73. and , Ann. Math. 47, 731 (1946).
E74. , letter to J. R. Oppenheimer, March 31, 1955.
E75. and B. Kaufman, Ann. Math. 59, 230 (1954).
E76. and , Ann. Math. 62, 128 (1955).
Fl. F. Fuchs and L. Hopf, Aerodynamik. R. C. Schmidt, Berlin, 1922.
F2. P. Frank, Einstein, His Life and Times, p. 82. A. Knopf, New York, 1953.
F3. See A. D. Fokker, Phys. Zeitschr. 15, 96 (1914).
F4. B. T. Feld and G. Weiss-Szilard (Eds.). The Collected Works of Leo Szilard, Vol.
1, p. 527. MIT Press, Cambridge, Mass., 1972.
F5. M. Fluckiger, Einstein in Bern, p. 148. Paul Haupt, Bern, 1974.