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@article{MZM_1985_37_2_a10, author = {I. K. Babenko}, title = {Zeros of the {Sturm--Liouville} equation with periodic potential}, journal = {Matemati\v{c}eskie zametki}, pages = {237--248}, publisher = {mathdoc}, volume = {37}, number = {2}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1985_37_2_a10/} }
I. K. Babenko. Zeros of the Sturm--Liouville equation with periodic potential. Matematičeskie zametki, Tome 37 (1985) no. 2, pp. 237-248. http://geodesic.mathdoc.fr/item/MZM_1985_37_2_a10/