Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1990_26_1_a21, author = {Ya. N. Mamedov}, title = {On some eigenvalue problems for an equation of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {163--167}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1990_26_1_a21/} }
Ya. N. Mamedov. On some eigenvalue problems for an equation of mixed type. Differencialʹnye uravneniâ, Tome 26 (1990) no. 1, pp. 163-167. http://geodesic.mathdoc.fr/item/DE_1990_26_1_a21/