%0 Journal Article
%A Nancy Childress
%T Examples of ...-invariants.
%J Manuscripta mathematica
%D 1990
%P 447-453
%V 68
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MM2_1990__68_2_155540/
%F MM2_1990__68_2_155540