@article{1183502717,
author = {Montgomery, Deane and Zippin, Leo},
title = {A theorem on the rotation group of the two-sphere},
journal = {Bull. Amer. Math. Soc.},
volume = {46},
number = {11},
year = {1940},
pages = { 520-521},
language = {en},
url = {http://dml.mathdoc.fr/item/1183502717}
}
Montgomery, Deane; Zippin, Leo. A theorem on the rotation group of the two-sphere. Bull. Amer. Math. Soc., Tome 46 (1940) no. 11, pp. 520-521. http://gdmltest.u-ga.fr/item/1183502717/