%0 Journal Article %A Zaidman, S. %T On a certain approximation property for first-order abstract differential equations %J Rendiconti del Seminario Matematico della Università di Padova %D 1971 %P 191-198 %V 46 %I Seminario Matematico of the University of Padua %U http://www.numdam.org/item/RSMUP_1971__46__191_0/ %G en %F RSMUP_1971__46__191_0