Contractibility and a generalization of absolute extensor
Portugaliae mathematica, Tome 30 (1971) no. 1, pp. 71-72.

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     author = {Saalfrank, C.W.},
     title = {Contractibility and a generalization of absolute extensor},
     journal = {Portugaliae mathematica},
     pages = {71--72},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115140/}
}
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Saalfrank, C.W. Contractibility and a generalization of absolute extensor. Portugaliae mathematica, Tome 30 (1971) no. 1, pp. 71-72. http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115140/