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@article{RCM_1988__22_1-4_181809, author = {Mohammad I. Khanfar}, title = {Lengths {In} {Semi-Free} {Groups.}}, journal = {Revista colombiana de matematicas}, pages = {67--76}, publisher = {mathdoc}, volume = {22}, number = {1-4}, year = {1988}, zbl = {0691.20018}, url = {http://geodesic.mathdoc.fr/item/RCM_1988__22_1-4_181809/} }
Mohammad I. Khanfar. Lengths In Semi-Free Groups.. Revista colombiana de matematicas, Tome 22 (1988) no. 1-4, pp. 67-76. http://geodesic.mathdoc.fr/item/RCM_1988__22_1-4_181809/