@article{1183555140, author = {Lewin, Jacques}, title = {Review: P. M. Cohn, Free rings and their relations}, journal = {Bull. Amer. Math. Soc. (N.S.)}, volume = {21}, number = {1}, year = {1989}, pages = { 139-142}, language = {en}, url = {http://dml.mathdoc.fr/item/1183555140} }
Lewin, Jacques. Review: P. M. Cohn, Free rings and their relations. Bull. Amer. Math. Soc. (N.S.), Tome 21 (1989) no. 1, pp. 139-142. http://gdmltest.u-ga.fr/item/1183555140/