%0 Journal Article
%A A. I. Mal'tsev
%T On derivative operations and predicates
%J Doklady Akademii Nauk
%D 1957
%P 24-27
%V 116
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_116_1_a5/
%G ru
%F DAN_1957_116_1_a5