@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/