@article{IVM_1968_3_a16,
     author = {L. B. Zelenko},
     title = {Letter to the editors},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {122},
     year = {1968},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_3_a16/}
}