't Hooft, 1976, Phys. Rev. Lett., 37, 8, 10.1103/PhysRevLett.37.8
1976, Phys. Rev., D14, 3432
Callan, 1976, Phys. Lett., 63B, 334, 10.1016/0370-2693(76)90277-X
Jackiw, 1976, Phys. Rev. Lett., 37, 172, 10.1103/PhysRevLett.37.172
Krasnikov, 1980, Teor. Mat. Fiz., 45, 313, 10.1007/BF01016704
Belavin, 1975, Phys. Lett., 58B, 85, 10.1016/0370-2693(75)90163-X
Christ, 1980, Phys. Rev., D21, 1591
Klinkhamer, 1984, Phys. Rev., D30, 2212
Linde, 1977, Phys. Lett., 70B, 306, 10.1016/0370-2693(77)90664-5
Linde, 1981, Phys. Lett., 100B, 37, 10.1016/0370-2693(81)90281-1
Dimopoulos, 1978, Phys. Rev., D18, 4500
Sakharov, 1967, Pis'ma Zh. Eksp. Teor. Fiz., 5, 32
Kuzmin, 1970, Pis'ma Zh. Eksp. Teor. Fiz., 13, 335
Ignatiev, 1978, Vol. 2, 293
1978, Phys. Lett., 76B, 436
Yoshimura, 1978, Phys. Rev. Lett., 41, 281, 10.1103/PhysRevLett.41.281
Yoshimura, 1979, Phys. Rev. Lett., 41, 476 (E)
Weinberg, 1979, Phys. Rev. Lett., 42, 850, 10.1103/PhysRevLett.42.850
Ignatiev, 1979, Phys. Lett., 87B, 114, 10.1016/0370-2693(79)90032-7
Krasnikov, 1978, Ya. Fiz., 28, 549
Gross, 1981, Rev. Mod. Phys., 53, 43, 10.1103/RevModPhys.53.43
Callan, 1978, Phys. Rev., D17, 2717
Kiskis, 1978, Phys. Rev., D18, 3690
Ambjørn, 1983, Nucl. Phys., B221, 381, 10.1016/0550-3213(83)90585-0
Krasnikov, 1979, J. Phys. (NY), 12, L343
Jackiw, 1977, Rev. Mod. Phys., 49, 681, 10.1103/RevModPhys.49.681
Callan, 1977, Phys. Rev., D16, 1762
Linde, 1979, Rep. Prog. Phys., 42, 389, 10.1088/0034-4885/42/3/001
1980, Phys. Lett., 96B, 289
Dashen, 1974, Phys. Rev., D10, 4138
Boguta, 1983, Phys. Rev. Lett., 50, 148, 10.1103/PhysRevLett.50.148
Forgacs, 1984, Phys. Lett., 138B, 397, 10.1016/0370-2693(84)91926-9
Treiman, 1980, Phys. Lett., 95B, 222, 10.1016/0370-2693(80)90474-8
Kuzmin, 1981, Phys. Lett., 105B, 163, 10.1016/0370-2693(81)91012-1
Georgi, 1974, Phys. Rev. Lett., 32, 438, 10.1103/PhysRevLett.32.438
Dolgov, 1979, Pis'ma Zh. Eksp. Teor. Fiz., 29, 254
Dolgov, 1980, Usp. Fiz. Nauk, 130, 559, 10.3367/UFNr.0130.198004b.0559