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@article{ARM_1975__11_4_a0, author = {Bartu\v{s}ek, Miroslav}, title = {On zeros of solutions of the differential equation $(p(t)y' )' +f(t, y, y' )=0$}, journal = {Archivum mathematicum}, pages = {187--192}, publisher = {mathdoc}, volume = {11}, number = {4}, year = {1975}, mrnumber = {0409975}, zbl = {0342.34018}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1975__11_4_a0/} }
Bartušek, Miroslav. On zeros of solutions of the differential equation $(p(t)y' )' +f(t, y, y' )=0$. Archivum mathematicum, Tome 11 (1975) no. 4, pp. 187-192. http://geodesic.mathdoc.fr/item/ARM_1975__11_4_a0/