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@article{CMH_1949__22_138957, author = {J.H.C. Whitehead}, title = {On simply connected, 4-dimensional polyhedra.}, journal = {Commentarii mathematici Helvetici}, pages = {48--92}, publisher = {mathdoc}, volume = {22}, year = {1949}, zbl = {0036.12704}, url = {http://geodesic.mathdoc.fr/item/CMH_1949__22_138957/} }
J.H.C. Whitehead. On simply connected, 4-dimensional polyhedra.. Commentarii mathematici Helvetici, Tome 22 (1949), pp. 48-92. http://geodesic.mathdoc.fr/item/CMH_1949__22_138957/