@article{119980, author = {Milo\v s H\'a\v cik}, title = {On a certain modification of Sturm's comparison theorem}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {12}, year = {1972}, pages = {15-18}, zbl = {0396.34025}, mrnumber = {0348185}, language = {en}, url = {http://dml.mathdoc.fr/item/119980} }
Háčik, Miloš. On a certain modification of Sturm's comparison theorem. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 12 (1972) pp. 15-18. http://gdmltest.u-ga.fr/item/119980/
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Generalization of Amplitude, Phase and Accompanying Differential Equation, Acta Univ. Palack. Olomucensis (to appear). | MR 0352583 | Zbl 0261.34006