Alan Ross Anderson, Nuel Belnap. The Pure Calculus of Entailment. Journal of Symbolic Logic, 27(1):19-52, 1962.
@article{AndersonB62,
title = {The Pure Calculus of Entailment},
author = {Alan Ross Anderson and Nuel Belnap},
year = {1962},
researchr = {https://researchr.org/publication/AndersonB62},
cites = {0},
citedby = {0},
journal = {Journal of Symbolic Logic},
volume = {27},
number = {1},
pages = {19-52},
}