@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/