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@article{MZ_1973__135_171996, author = {M.F. Newman and Jiri Sichler}, title = {Free {Products} of {Hopf} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {69--72}, publisher = {mathdoc}, volume = {135}, year = {1973}, zbl = {0274.20040}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__135_171996/} }
M.F. Newman; Jiri Sichler. Free Products of Hopf Groups.. Mathematische Zeitschrift, Tome 135 (1973), pp. 69-72. http://geodesic.mathdoc.fr/item/MZ_1973__135_171996/