@article{TMF_1970_3_3_a10,
     author = {S. L. Ginzburg and S. V. Maleev},
     title = {Unitarity conditions for a~many-body system at zero temperature},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {420--434},
     year = {1970},
     volume = {3},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_3_3_a10/}
}