@article{TMF_1974_21_2_a10,
     author = {N. N. Bogolyubov (Jr.) and A. G. Shumovskaya and A. S. Shumovskii},
     title = {Generalization of the minimax principle for model quasispin problems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {258--265},
     year = {1974},
     volume = {21},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_21_2_a10/}
}