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@article{MZ_1964__85_170303, author = {I.M.S. Dey}, title = {Free products of {Hopf} groups.}, journal = {Mathematische Zeitschrift}, pages = {274--284}, publisher = {mathdoc}, volume = {85}, year = {1964}, zbl = {0126.04803}, url = {http://geodesic.mathdoc.fr/item/MZ_1964__85_170303/} }
I.M.S. Dey. Free products of Hopf groups.. Mathematische Zeitschrift, Tome 85 (1964), pp. 274-284. http://geodesic.mathdoc.fr/item/MZ_1964__85_170303/