Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1975_11_10_a21, author = {V. A. Erovenko}, title = {$\lambda $-zones of instability for {Hill's} differential equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1890--1892}, publisher = {mathdoc}, volume = {11}, number = {10}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_10_a21/} }
V. A. Erovenko. $\lambda $-zones of instability for Hill's differential equation. Differencialʹnye uravneniâ, Tome 11 (1975) no. 10, pp. 1890-1892. http://geodesic.mathdoc.fr/item/DE_1975_11_10_a21/