@article{10_1017_S2040618500035437,
     author = {Geddes, A. and Walker, R. G.},
     title = {The structure of cancellative power-free groups},
     journal = {Glasgow mathematical journal},
     pages = {199--206},
     year = {1966},
     volume = {7},
     number = {4},
     doi = {10.1017/S2040618500035437},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500035437/}
}