A. Barna, 1968, Phys. Rev., 173, 1391, 10.1103/PhysRev.173.1391
V. Alles-Borelli, 1970, Lett. Nuovo Cimento, 4, 1156, 10.1007/BF02753664
A. K. Mann, 1971, Lett. Nuovo Cimento, 1, 486, 10.1007/BF02784677
S. L. Adler, 1968, Current Algebra
Ya B. Zel'dovich, 1962, Usp. Fiz. Nauk, 78, 549, 10.3367/UFNr.0078.196212a.0549
E. M. Lipmanov, 1964, Zh. Eksperim. i Teor. Fiz., 46, 1917
K. W. Roth, 1969, Nucl. Phys., B10, 241, 10.1016/0550-3213(69)90112-6
J. J. Sakurai, 1971, Lett. Nuovo Cimento, 1, 624, 10.1007/BF02770241
H. B. Thacker, 1971, Phys. Letters, 36B, 103, 10.1016/0370-2693(71)90119-5
C. K. Iddings, 1964, Phys. Rev., 135, B1388, 10.1103/PhysRev.135.B1388
N. Cabibbo, 1961, Phys. Rev., 124, 1577, 10.1103/PhysRev.124.1577
L. F. Li, 1971, Phys. Rev. D, 3, 1178, 10.1103/PhysRevD.3.1178
T. Kinoshita, 1957, Phys. Rev., 107, 593, 10.1103/PhysRev.107.593
N. Cabibbo, 1963, Phys. Rev. Letters, 10, 531, 10.1103/PhysRevLett.10.531
J. E. Augustine, 1969, Phys. Letters, 28B, 508, 10.1016/0370-2693(69)90529-2
S. Weinberg, 1967, Phys. Rev. Letters, 18, 507, 10.1103/PhysRevLett.18.507
T. Das, 1967, Phys. Rev. Letters, 18, 761, 10.1103/PhysRevLett.18.761
B. Bartoli, 1970, Nuovo Cimento, 70A, 615, 10.1007/BF02734498
N. Arteaga-Romero, 1971, Phys. Rev. D, 3, 1569, 10.1103/PhysRevD.3.1569
S. J. Brodsky, 1970, Phys. Rev. Letters, 25, 972, 10.1103/PhysRevLett.25.972
Y. S. Tsai, 1960, Phys. Rev., 120, 269, 10.1103/PhysRev.120.269
Y. S. Tsai, 1965, Phys. Rev., 140, B721, 10.1103/PhysRev.140.B721
