@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/}
}