TY  - JOUR
AU  - V. B. Shehtman
TI  - Squares of modal logics with additional connectives
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 2012
SP  - 721
EP  - 777
VL  - 67
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_2012_67_4_a2/
LA  - en
ID  - RM_2012_67_4_a2
ER  -