%0 Journal Article %A BarvĂ­nek, Erich %T An abstract model of linear differential transformations %J Archivum mathematicum %D 1975 %P 67-77 %V 11 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1975__11_2_a0/ %G en %F ARM_1975__11_2_a0