@article{GDZPPN002069822,
title = {Formal language theory and the geometry of 3-manifolds.},
journal = {Commentarii mathematici Helvetici},
volume = {71},
year = {1996},
pages = {525-555},
zbl = {0873.20026},
url = {http://dml.mathdoc.fr/item/GDZPPN002069822}
}
Bridson, M.R.; Gilman, Robert H. Formal language theory and the geometry of 3-manifolds.. Commentarii mathematici Helvetici, Tome 71 (1996) pp. 525-555. http://gdmltest.u-ga.fr/item/GDZPPN002069822/