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@article{PORMA_1948__7_4_114666, author = {Hu, Sze-Tsen}, title = {On the {Whitehead} group of automorphisms of the relative homotopy groups}, journal = {Portugaliae mathematica}, pages = {181--206}, publisher = {mathdoc}, volume = {7}, number = {4}, year = {1948}, mrnumber = {0033526}, zbl = {0035.38902}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1948__7_4_114666/} }
Hu, Sze-Tsen. On the Whitehead group of automorphisms of the relative homotopy groups. Portugaliae mathematica, Tome 7 (1948) no. 4, pp. 181-206. http://geodesic.mathdoc.fr/item/PORMA_1948__7_4_114666/