@article{1093956081, author = {Perkins, Peter}, title = {Unsolvable problems for equational theories.}, journal = {Notre Dame J. Formal Logic}, volume = {8}, number = {3}, year = {1967}, pages = { 175-185}, language = {en}, url = {http://dml.mathdoc.fr/item/1093956081} }
Perkins, Peter. Unsolvable problems for equational theories.. Notre Dame J. Formal Logic, Tome 8 (1967) no. 3, pp. 175-185. http://gdmltest.u-ga.fr/item/1093956081/