TY  - JOUR
AU  - V. A. Yankov
TI  - The calculus of the weak “Law of excluded middle”
JO  - Izvestiya. Mathematics
PY  - 1968
SP  - 997
EP  - 1004
VL  - 2
IS  - 5
UR  - http://geodesic.mathdoc.fr/item/IM2_1968_2_5_a3/
LA  - en
ID  - IM2_1968_2_5_a3
ER  -