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@article{MASLO_1983__33_4_a6, author = {Rovder, Jozef}, title = {Oscillatory properties of the fourth order linear differential equation}, journal = {Mathematica slovaca}, pages = {371--379}, publisher = {mathdoc}, volume = {33}, number = {4}, year = {1983}, mrnumber = {720507}, zbl = {0525.34027}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1983__33_4_a6/} }
Rovder, Jozef. Oscillatory properties of the fourth order linear differential equation. Mathematica slovaca, Tome 33 (1983) no. 4, pp. 371-379. http://geodesic.mathdoc.fr/item/MASLO_1983__33_4_a6/