@misc{DE_1990_26_5_a0,
     title = {Nikola{\v\i} {Pavlovich} {Erugin}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {739--740},
     publisher = {mathdoc},
     volume = {26},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_5_a0/}
}