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@article{PORMA_1963__22_4_114910, author = {McCandless, Byron H.}, title = {Retracts and extension spaces for perfectly normal spaces - {II}}, journal = {Portugaliae mathematica}, pages = {205--207}, publisher = {mathdoc}, volume = {22}, number = {4}, year = {1963}, zbl = {0122.17501}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1963__22_4_114910/} }
McCandless, Byron H. Retracts and extension spaces for perfectly normal spaces - II. Portugaliae mathematica, Tome 22 (1963) no. 4, pp. 205-207. http://geodesic.mathdoc.fr/item/PORMA_1963__22_4_114910/