TY  - JOUR
AU  - R. Routley
TI  - A Semantical Analysis of Implicational System I and of the First Degree of Entailment.
JO  - Mathematische Annalen
PY  - 1972
SP  - 58
EP  - 84
VL  - 196
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1972__196_162243/
ID  - MAN_1972__196_162243
ER  -