@article{1102947945,
author = {Eaton, W. T.},
title = {A two sided approximation theorem for $2$-spheres.},
journal = {Pacific J. Math.},
volume = {49},
number = {2},
year = {1973},
pages = { 461-485},
language = {en},
url = {http://dml.mathdoc.fr/item/1102947945}
}
Eaton, W. T. A two sided approximation theorem for $2$-spheres.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 461-485. http://gdmltest.u-ga.fr/item/1102947945/