@article{DE_1969_5_9_a14,
     author = {V. G. Hryptun},
     title = {Necessary conditions for operator quasianalyticity},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1690--1699},
     publisher = {mathdoc},
     volume = {5},
     number = {9},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_9_a14/}
}