@article{GDZPPN002201356,
title = {Subgroups of small cancellation groups.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {346},
year = {1984},
pages = {24-54},
zbl = {0523.20024},
url = {http://dml.mathdoc.fr/item/GDZPPN002201356}
}
Pride, S.J.; Hill, Pat; Vella, A.D. Subgroups of small cancellation groups.. Journal für die reine und angewandte Mathematik, Tome 346 (1984) pp. 24-54. http://gdmltest.u-ga.fr/item/GDZPPN002201356/