TY  - JOUR
AU  - V. I. Liberzon
AU  - V. S. Shul'man
TI  - Operator-irreducible symmetric algebras of operators in the $\mathbf\Pi^1$ Pontryagin space
JO  - Izvestiya. Mathematics 
PY  - 1971
SP  - 1168
EP  - 1179
VL  - 5
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1971_5_5_a10/
LA  - en
ID  - IM2_1971_5_5_a10
ER  -