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@article{CMH_1955__29_139095, author = {P.J. Hilton}, title = {On the homotopy groups of unions of spaces.}, journal = {Commentarii mathematici Helvetici}, pages = {59--92}, publisher = {mathdoc}, volume = {29}, year = {1955}, zbl = {0064.17203}, url = {http://geodesic.mathdoc.fr/item/CMH_1955__29_139095/} }
P.J. Hilton. On the homotopy groups of unions of spaces.. Commentarii mathematici Helvetici, Tome 29 (1955), pp. 59-92. http://geodesic.mathdoc.fr/item/CMH_1955__29_139095/