%0 Journal Article %A Spiridonova, Margarita %T Operational Methods in the Environment of a Computer Algebra System %J Serdica Journal of Computing %D 2009 %P 381-424 %V 3 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SJC_2009_3_4_a3/ %G en %F SJC_2009_3_4_a3