@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/