Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1968_178_3_a10, author = {Yu. N. Smirnov}, title = {Lines of equal values of $\mu$ in the instability zones for the {Mathieu} equation}, journal = {Doklady Akademii Nauk}, pages = {546--547}, publisher = {mathdoc}, volume = {178}, number = {3}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a10/} }
Yu. N. Smirnov. Lines of equal values of $\mu$ in the instability zones for the Mathieu equation. Doklady Akademii Nauk, Tome 178 (1968) no. 3, pp. 546-547. http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a10/