@article{1093893523, author = {Tursman, Richard}, title = {The shortest axioms of the implicational calculus.}, journal = {Notre Dame J. Formal Logic}, volume = {9}, number = {1}, year = {1968}, pages = { 351-358}, language = {en}, url = {http://dml.mathdoc.fr/item/1093893523} }
Tursman, Richard. The shortest axioms of the implicational calculus.. Notre Dame J. Formal Logic, Tome 9 (1968) no. 1, pp. 351-358. http://gdmltest.u-ga.fr/item/1093893523/