@article{1093894367,
author = {Bradley, M. C.},
title = {Copi's method of deduction again.},
journal = {Notre Dame J. Formal Logic},
volume = {12},
number = {1},
year = {1971},
pages = { 454-458},
language = {en},
url = {http://dml.mathdoc.fr/item/1093894367}
}
Bradley, M. C. Copi's method of deduction again.. Notre Dame J. Formal Logic, Tome 12 (1971) no. 1, pp. 454-458. http://gdmltest.u-ga.fr/item/1093894367/