@article{DE_1967_3_8_a4,
     author = {A. Ya. Kovalenko},
     title = {The highest exponent and the critical exponent of certain differential equations in a {Banach} space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1259--1265},
     publisher = {mathdoc},
     volume = {3},
     number = {8},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_8_a4/}
}