M. Gell-Mann, 1961, Phys. Rev. Lett., 6, 70, 10.1103/PhysRevLett.6.70
M. J. Levine, 1967, Nuovo Cimento A, 48, 67, 10.1007/BF02721342
B. W. Lynn, 1981, Phys. Rev. D, 23, 2151, 10.1103/PhysRevD.23.2151
B. W. Lee, 1977, Phys. Rev. D, 16, 1944, 10.1103/PhysRevB.16.1944
R. J. Crewther, 1982, Nucl. Phys., B207, 269, 10.1016/0550-3213(82)90165-1
M. B. Voloshin, 1986, Yad. Fiz., 44, 845
L. B. Okun, 1986, Yad. Fiz., 44, 677
L. B. Okun, 1986, Zh. Eks. Teor. Fiz., 91, 754
M. B. Voloshin, 1988, Yad. Fiz., 48, 804
M. Leurer, 1990, Phys. Lett. B, 237, 81, 10.1016/0370-2693(90)90466-J
H. Georgi, 1990, Phys. Lett. B, 244, 196, 10.1016/0370-2693(90)90055-B
G. Feinberg, 1968, Phys. Rev., 166, 1638, 10.1103/PhysRev.166.1638
L. Rosenberg, 1963, Phys. Rev., 129, 2786, 10.1103/PhysRev.129.2786
S. Adler, 1969, Phys. Rev., 177, 2426, 10.1103/PhysRev.177.2426
J. S. Bell, 1969, Nuovo Cimento A, 60, 47, 10.1007/BF02823296
J. F. Nieves, 1983, Phys. Rev. D, 28, 1664, 10.1103/PhysRevD.28.1664
R. K. Ghosh, 1984, Phys. Rev. D, 29, 493, 10.1103/PhysRevD.29.493
J. A. Morgan, 1981, Phys. Lett., 102B, 247, 10.1016/0370-2693(81)90868-6
M. Fukugita, 1987, Phys. Rev. D, 36, 3817, 10.1103/PhysRevD.36.3817
K. J. F. Gaemers, 1989, Phys. Rev. D, 40, 309, 10.1103/PhysRevD.40.309
P. Sutherland, 1976, Phys. Rev. D, 13, 2700, 10.1103/PhysRevD.13.2700
G. Feinberg, 1965, Phys. Rev., 139, 1619, 10.1103/PhysRev.139.B1619