TY  - JOUR
AU  - Helmer Aslaksen
TI  - SO(2) invariants of a set of 2 x 2 matrices.
JO  - Mathematica Scandinavica
PY  - 1989
SP  - 59
EP  - 66
VL  - 65
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1989__65_2_167066/
ID  - MS2_1989__65_2_167066
ER  -