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@article{PORMA_1961__20_1_114847, author = {Saalfrank, C.W.}, title = {Neighborhood retraction generalized for compact {Hausdorff} spaces}, journal = {Portugaliae mathematica}, pages = {11--16}, publisher = {mathdoc}, volume = {20}, number = {1}, year = {1961}, mrnumber = {0126830}, zbl = {0099.17405}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1961__20_1_114847/} }
Saalfrank, C.W. Neighborhood retraction generalized for compact Hausdorff spaces. Portugaliae mathematica, Tome 20 (1961) no. 1, pp. 11-16. http://geodesic.mathdoc.fr/item/PORMA_1961__20_1_114847/