%0 Journal Article
%A Vadim E. Levit
%A Eugen Mandrescu
%T A set and collection lemma
%J The electronic journal of combinatorics
%D 2014
%V 21
%N 1
%U http://geodesic.mathdoc.fr/articles/10.37236/2514/
%R 10.37236/2514
%F 10_37236_2514