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@article{PORMA_1949__8_3_114679, author = {Ma, L.}, title = {On relations between homology and homotopy groups}, journal = {Portugaliae mathematica}, pages = {107--135}, publisher = {mathdoc}, volume = {8}, number = {3}, year = {1949}, mrnumber = {0038659}, zbl = {0038.36503}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1949__8_3_114679/} }
Ma, L. On relations between homology and homotopy groups. Portugaliae mathematica, Tome 8 (1949) no. 3, pp. 107-135. http://geodesic.mathdoc.fr/item/PORMA_1949__8_3_114679/