@article{bwmeta1.element.bwnjournal-article-fmv115i1p2bwm,
author = {A. Suszycki},
title = {Retracts and homotopies for multi-maps},
journal = {Fundamenta Mathematicae},
volume = {115},
year = {1983},
pages = {9-26},
zbl = {0529.55013},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv115i1p2bwm}
}
Suszycki, A. Retracts and homotopies for multi-maps. Fundamenta Mathematicae, Tome 115 (1983) pp. 9-26. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv115i1p2bwm/