@article{1093891297, author = {Szabo, Manfred E.}, title = {A categorical equivalence of proofs.}, journal = {Notre Dame J. Formal Logic}, volume = {15}, number = {1}, year = {1974}, pages = { 177-191}, language = {en}, url = {http://dml.mathdoc.fr/item/1093891297} }
Szabo, Manfred E. A categorical equivalence of proofs.. Notre Dame J. Formal Logic, Tome 15 (1974) no. 1, pp. 177-191. http://gdmltest.u-ga.fr/item/1093891297/