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@article{PORMA_1983__42_4_115550, author = {Khambadkone, Meera}, title = {A radical for free groups}, journal = {Portugaliae mathematica}, pages = {337--342}, publisher = {mathdoc}, volume = {42}, number = {4}, year = {1983}, mrnumber = {0836113}, zbl = {0585.20028}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1983__42_4_115550/} }
Khambadkone, Meera. A radical for free groups. Portugaliae mathematica, Tome 42 (1983) no. 4, pp. 337-342. http://geodesic.mathdoc.fr/item/PORMA_1983__42_4_115550/