@misc{DE_1980_16_10_a24,
     title = {Giovanni {Sansone}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1906--1913},
     publisher = {mathdoc},
     volume = {16},
     number = {10},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_10_a24/}
}