@article{1178240982, author = {Watson, Bill}, title = {$\delta $-commuting mappings and Betti numbers}, journal = {Tohoku Math. J. (2)}, volume = {27}, number = {4}, year = {1975}, pages = { 135-152}, language = {en}, url = {http://dml.mathdoc.fr/item/1178240982} }
Watson, Bill. $\delta $-commuting mappings and Betti numbers. Tohoku Math. J. (2), Tome 27 (1975) no. 4, pp. 135-152. http://gdmltest.u-ga.fr/item/1178240982/