%0 Journal Article
%A H. Schwerdtfeger
%T Invariants of a class of transformation groups. (Short Communication).
%J Aequationes mathematicae
%D 1975
%P 318-319
%V 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1975__12_136520/
%F AM2_1975__12_136520