@article{TMF_1977_30_1_a16,
     author = {M. M. Mestechkin},
     title = {On~the paper {``Theory} of reduced density matrix'' {by~E.\,S.~Kryachko}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {142--143},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a16/}
}