@article{DE_1987_23_7_a19, author = {M. A. Demidov and Yu. A. Klokov and A. P. Mikhailov}, title = {On some singular problems for second-order ordinary differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1278--1282}, publisher = {mathdoc}, volume = {23}, number = {7}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1987_23_7_a19/} }