@article{1183740562, author = {Maddux, Roger}, title = {The Equational Theory of $CA\_3$ is Undecidable}, journal = {J. Symbolic Logic}, volume = {45}, number = {1}, year = {1980}, pages = { 311-316}, language = {en}, url = {http://dml.mathdoc.fr/item/1183740562} }
Maddux, Roger. The Equational Theory of $CA_3$ is Undecidable. J. Symbolic Logic, Tome 45 (1980) no. 1, pp. 311-316. http://gdmltest.u-ga.fr/item/1183740562/