@article{2536, author = {Doyle, P.H.}, title = {Neighborhood deformation retraction in manifolds}, journal = {Portugaliae mathematica}, volume = {26}, year = {1967}, pages = {273-274}, zbl = {0187.45301}, mrnumber = {0257997}, language = {en}, url = {http://dml.mathdoc.fr/item/2536} }
Doyle, P.H. Neighborhood deformation retraction in manifolds. Portugaliae mathematica, Tome 26 (1967) pp. 273-274. http://gdmltest.u-ga.fr/item/2536/