@article{TMF_1989_81_3_a2,
     author = {M. K. Volkov and A. N. Ivanov and M. Nagy and N. I. Troitskaya},
     title = {Quark model of~superconducting type and nondiagonal $P$--$A$ transitions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {354--368},
     publisher = {mathdoc},
     volume = {81},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_81_3_a2/}
}