%0 Journal Article %A Ĺ eda, Valter %T A comparison theorem in the theory of the second-order linear differential transformations %J Archivum mathematicum %D 1969 %P 7-17 %V 05 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1969__5_1_a1/ %G en %F ARM_1969__5_1_a1