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@article{MZ_1973__130_171863, author = {Philip R. Heath}, title = {Groupoid {Operations} and {Fibre-Homotopy} {Equivalence.} {I.}}, journal = {Mathematische Zeitschrift}, pages = {207--234}, publisher = {mathdoc}, volume = {130}, year = {1973}, zbl = {0253.55008}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__130_171863/} }
Philip R. Heath. Groupoid Operations and Fibre-Homotopy Equivalence. I.. Mathematische Zeitschrift, Tome 130 (1973), pp. 207-234. http://geodesic.mathdoc.fr/item/MZ_1973__130_171863/