@article{GDZPPN002542307,
title = {On commuting elemts of groups acting on trees},
journal = {Revista colombiana de matematicas},
volume = {27},
year = {1993},
pages = {293-301},
zbl = {0813.20025},
url = {http://dml.mathdoc.fr/item/GDZPPN002542307}
}
Mahmud, R. M. S. On commuting elemts of groups acting on trees. Revista colombiana de matematicas, Tome 27 (1993) pp. 293-301. http://gdmltest.u-ga.fr/item/GDZPPN002542307/