@article{1183735622, author = {Hanson, William H.}, title = {On some Alleged Decision Procedures for S4}, journal = {J. Symbolic Logic}, volume = {31}, number = {1}, year = {1966}, pages = { 641-643}, language = {en}, url = {http://dml.mathdoc.fr/item/1183735622} }
Hanson, William H. On some Alleged Decision Procedures for S4. J. Symbolic Logic, Tome 31 (1966) no. 1, pp. 641-643. http://gdmltest.u-ga.fr/item/1183735622/