@misc{DE_1997_33_12_a18,
     title = {\`Eduard {Iosifovich} {Grudo}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1708--1713},
     publisher = {mathdoc},
     volume = {33},
     number = {12},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_12_a18/}
}