Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1979_15_3_a21, author = {R. R. Mkrtumyan}, title = {A case of integrability of a second-order linear equation}, journal = {Differencialʹnye uravneni\^a}, pages = {555--559}, publisher = {mathdoc}, volume = {15}, number = {3}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1979_15_3_a21/} }
R. R. Mkrtumyan. A case of integrability of a second-order linear equation. Differencialʹnye uravneniâ, Tome 15 (1979) no. 3, pp. 555-559. http://geodesic.mathdoc.fr/item/DE_1979_15_3_a21/