@article{TMF_1988_74_2_a1,
     author = {M. L. Nekrasov and V. E. Rochev},
     title = {The $\rm O^-$ nonet and~solution of the~$U(1)$ problem in~a~nonperturbative approximation of~quantum chromodynamics},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {171--179},
     publisher = {mathdoc},
     volume = {74},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_74_2_a1/}
}