@article{DE_1969_5_7_a18,
     author = {V. N. Laptinskij and L. P. Yurasova},
     title = {A certain differential inequality},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1324--1325},
     publisher = {mathdoc},
     volume = {5},
     number = {7},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_7_a18/}
}