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@article{PORMA_1967__26_3_115026, author = {Doyle, P.H.}, title = {Neighborhood deformation retraction in manifolds}, journal = {Portugaliae mathematica}, pages = {273--274}, publisher = {mathdoc}, volume = {26}, number = {3}, year = {1967}, mrnumber = {0257997}, zbl = {0187.45301}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_3_115026/} }
Doyle, P.H. Neighborhood deformation retraction in manifolds. Portugaliae mathematica, Tome 26 (1967) no. 3, pp. 273-274. http://geodesic.mathdoc.fr/item/PORMA_1967__26_3_115026/