G. Y. Rainick. A formal system. Notre Dame Journal of Formal Logic, 1(3):123-126, 1960. [doi]
@article{Rainick60,
title = {A formal system},
author = {G. Y. Rainick},
year = {1960},
doi = {10.1305/ndjfl/1093956556},
url = {http://dx.doi.org/10.1305/ndjfl/1093956556},
researchr = {https://researchr.org/publication/Rainick60},
cites = {0},
citedby = {0},
journal = {Notre Dame Journal of Formal Logic},
volume = {1},
number = {3},
pages = {123-126},
}