@article{05018822,
title = {Metric subgroups of isometries on an ultrametric space.},
journal = {Acta Universitatis Apulensis. Mathematics - Informatics},
volume = {9},
year = {2005},
pages = {3-12},
zbl = {1102.11067},
language = {en},
url = {http://dml.mathdoc.fr/item/05018822}
}
Zaharescu, Alexandru. Metric subgroups of isometries on an ultrametric space.. Acta Universitatis Apulensis. Mathematics - Informatics, Tome 9 (2005) pp. 3-12. http://gdmltest.u-ga.fr/item/05018822/