@article{bwmeta1.element.bwnjournal-article-fmv57i1p17bwm,
author = {S. Hildebrand and D. Sanderson},
title = {Connectivity functions and retracts},
journal = {Fundamenta Mathematicae},
volume = {57},
year = {1965},
pages = {237-245},
zbl = {0149.19702},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv57i1p17bwm}
}
Hildebrand, S.; Sanderson, D. Connectivity functions and retracts. Fundamenta Mathematicae, Tome 57 (1965) pp. 237-245. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv57i1p17bwm/