@article{DE_1989_25_9_a32,
     author = {N. P. Erugin},
     title = {Mary {Lucy} {Cartwright}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1642--1646},
     publisher = {mathdoc},
     volume = {25},
     number = {9},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_9_a32/}
}