TY  - JOUR
TI  - Upper Triangular Invariants
JO  - Canadian mathematical bulletin
PY  - 1985
SP  - 243
EP  - 248
VL  - 28
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1985-030-2/
DO  - 10.4153/CMB-1985-030-2
ID  - 10_4153_CMB_1985_030_2
ER  -