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@article{10_4064_cm_44_2_291_299, author = {Aleksander Ca{\l}ka}, title = {Curvature of lift spaces}, journal = {Colloquium Mathematicum}, pages = {291--299}, publisher = {mathdoc}, volume = {44}, number = {2}, year = {1981}, doi = {10.4064/cm-44-2-291-299}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-44-2-291-299/} }
Aleksander Całka. Curvature of lift spaces. Colloquium Mathematicum, Tome 44 (1981) no. 2, pp. 291-299. doi : 10.4064/cm-44-2-291-299. http://geodesic.mathdoc.fr/articles/10.4064/cm-44-2-291-299/
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