@article{DE_1971_7_3_a20,
     author = {Yu. K. Lando},
     title = {The {M.} {V.} {Keldy{\v} s} series},
     journal = {Differencialʹnye uravneni\^a},
     pages = {545--548},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_3_a20/}
}