@article{1093882535, author = {Johnson, Frederick A.}, title = {Copi's method of deduction.}, journal = {Notre Dame J. Formal Logic}, volume = {20}, number = {1}, year = {1979}, pages = { 295-300}, language = {en}, url = {http://dml.mathdoc.fr/item/1093882535} }
Johnson, Frederick A. Copi's method of deduction.. Notre Dame J. Formal Logic, Tome 20 (1979) no. 1, pp. 295-300. http://gdmltest.u-ga.fr/item/1093882535/