@article{AUPO_1972__12_1_a1,
     author = {H\'a\v{c}ik, Milo\v{s}},
     title = {On a certain modification of {Sturm's} comparison theorem},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {15--18},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1972},
     mrnumber = {0348185},
     zbl = {0396.34025},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1972__12_1_a1/}
}