@article{GDZPPN002213451,
title = {Approach regions for trees and the unit disc.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {475},
year = {1996},
pages = {157-176},
zbl = {0839.31012},
url = {http://dml.mathdoc.fr/item/GDZPPN002213451}
}
Arcozzi, N.; Di Biase, F.; Urbanke, R. Approach regions for trees and the unit disc.. Journal für die reine und angewandte Mathematik, Tome 475 (1996) pp. 157-176. http://gdmltest.u-ga.fr/item/GDZPPN002213451/