@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},
     year = {1969},
     volume = {5},
     number = {1},
     mrnumber = {0274862},
     zbl = {0242.34036},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1969_5_1_a1/}
}