@article{1255630892, author = {Richardson, R. W.}, title = {Groups acting on the 4-sphere}, journal = {Illinois J. Math.}, volume = {5}, number = {1}, year = {1961}, pages = { 474-485}, language = {en}, url = {http://dml.mathdoc.fr/item/1255630892} }
Richardson, R. W. Groups acting on the 4-sphere. Illinois J. Math., Tome 5 (1961) no. 1, pp. 474-485. http://gdmltest.u-ga.fr/item/1255630892/