@article{TMF_1970_5_2_a6,
     author = {P. N. Bogolyubov},
     title = {Quasipotential equations for spin particles with different masses},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {244--252},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_5_2_a6/}
}