@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/