@article{DE_1965_1_9_a3,
     author = {A. F. Andreev},
     title = {On the number of operations used in {Frommer's} method for investigation of a singular point of a differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1155--1176},
     publisher = {mathdoc},
     volume = {1},
     number = {9},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_9_a3/}
}