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@article{PORMA_1961__20_2_114855, author = {Hu, Sze-Tsen}, title = {An axiomatic approach to homotopy theory without using the relative groups}, journal = {Portugaliae mathematica}, pages = {95--103}, publisher = {mathdoc}, volume = {20}, number = {2}, year = {1961}, mrnumber = {0131273}, zbl = {0096.37503}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1961__20_2_114855/} }
Hu, Sze-Tsen. An axiomatic approach to homotopy theory without using the relative groups. Portugaliae mathematica, Tome 20 (1961) no. 2, pp. 95-103. http://geodesic.mathdoc.fr/item/PORMA_1961__20_2_114855/