%0 Journal Article %A Maciej Szymkat %T The form of the n-th iteration of the operator q=fd/dx %J Mathematica Applicanda %D 1983 %P 227-249 %V 11 %N 22 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14708/ma.v11i22.1591/ %R 10.14708/ma.v11i22.1591 %G pl %F 10_14708_ma_v11i22_1591