@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/}
}