@article{AUPO_1977__16_1_a4,
     author = {Stan\v{e}k, Svatoslav},
     title = {Integral properties of coefficients of the 2$^nd$ order linear differential equations having the same distribution of zeros of solutions},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {69--73},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1977},
     mrnumber = {0594949},
     zbl = {0408.34009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1977__16_1_a4/}
}