@article{104838, author = {Miroslav Bartu\v sek}, title = {On the distribution of zeros of solutions of some types of differential equation $y''=q(t)y$}, journal = {Archivum Mathematicum}, volume = {011}, year = {1975}, pages = {1-24}, zbl = {0342.34017}, mrnumber = {0427735}, language = {en}, url = {http://dml.mathdoc.fr/item/104838} }
Bartušek, Miroslav. On the distribution of zeros of solutions of some types of differential equation $y''=q(t)y$. Archivum Mathematicum, Tome 011 (1975) pp. 1-24. http://gdmltest.u-ga.fr/item/104838/
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