@article{AUPO_1991__30_1_a9,
     author = {Fialka, Miloslav},
     title = {On the position of nodes of associated equations to the differential equation $y'-q(t)y=r(t)$},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {107--119},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1991},
     mrnumber = {1166430},
     zbl = {0752.34023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1991__30_1_a9/}
}