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@article{IM_1981__63_142788, author = {R.P. Osborne and H. Zieschang}, title = {Primitives in the {Free} {Group} on {Two} {Generators.}}, journal = {Inventiones mathematicae}, pages = {17--24}, publisher = {mathdoc}, volume = {63}, year = {1981}, zbl = {0438.20017}, url = {http://geodesic.mathdoc.fr/item/IM_1981__63_142788/} }
R.P. Osborne; H. Zieschang. Primitives in the Free Group on Two Generators.. Inventiones mathematicae, Tome 63 (1981), pp. 17-24. http://geodesic.mathdoc.fr/item/IM_1981__63_142788/