%0 Journal Article %A Charvát, František %T On problems concerning uniqueness of the extension of linear operations on linear spaces %J Commentationes Mathematicae Universitatis Carolinae %D 1971 %P 271-280 %V 12 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1971__12_2_a4/ %G en %F CMUC_1971__12_2_a4