TY  - JOUR
AU  - V. A. Matulis
TI  - Variants of the classical predicate calculus with a unique tree of deduction
JO  - Doklady Akademii Nauk
PY  - 1963
SP  - 768
EP  - 770
VL  - 148
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1963_148_4_a7/
LA  - ru
ID  - DAN_1963_148_4_a7
ER  -