@article{1077375501,
author = {Hempel, John},
title = {Closing a surface in $E\sp{3}$},
journal = {Duke Math. J.},
volume = {31},
number = {1},
year = {1964},
pages = { 611-615},
language = {en},
url = {http://dml.mathdoc.fr/item/1077375501}
}
Hempel, John. Closing a surface in $E\sp{3}$. Duke Math. J., Tome 31 (1964) no. 1, pp. 611-615. http://gdmltest.u-ga.fr/item/1077375501/