@article{articlef2abd41e,
title   = {A semantical analysis of the calculi Cn},
author = {Costa, Newton Carneiro Affonso da and Alves, Elias Humberto},
year = {1977},
doi = {10.1305/ndjfl/1093888132},
publisher = {University od Notre Dame},
journal   = {Notre Dame Journal of Formal Logic}
}