@article{AUPO_1990__29_1_a11,
     author = {Laitochov\'a, Jitka},
     title = {The {Sturm} comparison theorem for $i$-conjugate numbers},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {197--206},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1990},
     mrnumber = {1144838},
     zbl = {0756.34014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1990__29_1_a11/}
}