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@article{ARM_1969__5_1_a1, author = {\v{S}eda, Valter}, title = {A comparison theorem in the theory of the second-order linear differential transformations}, journal = {Archivum mathematicum}, pages = {7--17}, publisher = {mathdoc}, volume = {05}, number = {1}, year = {1969}, mrnumber = {0274862}, zbl = {0242.34036}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1969__5_1_a1/} }
Šeda, Valter. A comparison theorem in the theory of the second-order linear differential transformations. Archivum mathematicum, Tome 05 (1969) no. 1, pp. 7-17. http://geodesic.mathdoc.fr/item/ARM_1969__5_1_a1/