@inproceedings{inproceedings434b05c2,
title   = {Underground timestone mining in brazil as an economic environmental issue},
author = {Hennies, Wildor Theodoro and Stellin Junior, Antônio and Ghizzi, L C},
year = {1995},
publisher = {Balkema},
booktitle   = {International Symposium on Mine Planning and Equipment Selection}
}