Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1987_41_2_a8, author = {V. M. Koltyzhenkov}, title = {Irregular second-order differential equations with almost-periodic coefficients}, journal = {Matemati\v{c}eskie zametki}, pages = {202--206}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_2_a8/} }
V. M. Koltyzhenkov. Irregular second-order differential equations with almost-periodic coefficients. Matematičeskie zametki, Tome 41 (1987) no. 2, pp. 202-206. http://geodesic.mathdoc.fr/item/MZM_1987_41_2_a8/