TY  - JOUR
AU  - I. A. Levina
TI  - On the class number of exact ideals for $Z$-rings in a commutative $Q$-algebra
JO  - Matematičeskie zametki
PY  - 1972
SP  - 381
EP  - 388
VL  - 11
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1972_11_4_a3/
LA  - ru
ID  - MZM_1972_11_4_a3
ER  -