%0 Journal Article
%A Day, Alan
%T Idempotents in The Groupoid of all SP Classes of Lattices
%J Canadian mathematical bulletin
%D 1978
%P 499-501
%V 21
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-085-2/
%R 10.4153/CMB-1978-085-2
%F 10_4153_CMB_1978_085_2