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@article{IM_1988__94_2_143624, author = {Michael H. Freedman}, title = {Whitehead 3 is a}, journal = {Inventiones mathematicae}, pages = {175--182}, publisher = {mathdoc}, volume = {94}, number = {2}, year = {1988}, zbl = {0678.57002}, url = {http://geodesic.mathdoc.fr/item/IM_1988__94_2_143624/} }
Michael H. Freedman. Whitehead 3 is a. Inventiones mathematicae, Tome 94 (1988) no. 2, pp. 175-182. http://geodesic.mathdoc.fr/item/IM_1988__94_2_143624/