@article{JRAM_1984__349_152620,
     author = {S.J. Pride and Pat Hill and A.D. Vella},
     title = {Subgroups of small cancellation groups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {24--54},
     publisher = {mathdoc},
     volume = {349},
     year = {1984},
     zbl = {0523.20024},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1984__349_152620/}
}