@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/