@article{bwmeta1.element.desklight-826865e6-b210-4655-868a-b268fd1aaaaf,
author = {Aleksander Ca\l ka},
title = {Curvature of lift spaces},
journal = {Colloquium Mathematicae},
volume = {44},
year = {1981},
pages = {291-299},
zbl = {0515.57012},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-826865e6-b210-4655-868a-b268fd1aaaaf}
}
Aleksander Całka. Curvature of lift spaces. Colloquium Mathematicae, Tome 44 (1981) pp. 291-299. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-826865e6-b210-4655-868a-b268fd1aaaaf/