%0 Journal Article
%A Helmer Aslaksen
%T SO(2) invariants of a set of 2 x 2 matrices.
%J Mathematica Scandinavica
%D 1989
%P 59-66
%V 65
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1989__65_2_167066/
%F MS2_1989__65_2_167066