@article{DAN_1970_190_4_a7,
     author = {Yu. I. Lyubich and V. A. Tkachenko},
     title = {Quasianalyticity criterion for abstract operators},
     journal = {Doklady Akademii Nauk},
     pages = {772--774},
     publisher = {mathdoc},
     volume = {190},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_190_4_a7/}
}