Raymond D. Gumb. Free logic is a natural logic. In Arthur M. Riehl, editor, Computer Trends in the 1990s - Proceedings of the 1989 ACM 17th Annual Computer Science Conference, Louisville, Kentucky, USA, February 21-23, 1989. pages 466, ACM, 1989. [doi]
@inproceedings{Gumb89-0,
title = {Free logic is a natural logic},
author = {Raymond D. Gumb},
year = {1989},
doi = {10.1145/75427.1030296},
url = {http://doi.acm.org/10.1145/75427.1030296},
researchr = {https://researchr.org/publication/Gumb89-0},
cites = {0},
citedby = {0},
pages = {466},
booktitle = {Computer Trends in the 1990s - Proceedings of the 1989 ACM 17th Annual Computer Science Conference, Louisville, Kentucky, USA, February 21-23, 1989},
editor = {Arthur M. Riehl},
publisher = {ACM},
isbn = {0-89791-299-3},
}