@article{IVM_1970_1_a9,
     author = {S. G. Mamikonyan},
     title = {The approximation of semigroups that satisfy a~commutator condition},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {70--72},
     publisher = {mathdoc},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_1_a9/}
}