@article{1077311639, author = {Ocken, Stanley}, title = {The commutativity of tunnel sum}, journal = {Duke Math. J.}, volume = {43}, number = {1}, year = {1976}, pages = { 285-294}, language = {en}, url = {http://dml.mathdoc.fr/item/1077311639} }
Ocken, Stanley. The commutativity of tunnel sum. Duke Math. J., Tome 43 (1976) no. 1, pp. 285-294. http://gdmltest.u-ga.fr/item/1077311639/