@misc{misc3c974e36,
title   = {The Study of natural radiation distribution in},
author = {Matsumoto, M. M. and Silveira, M. A. G. and Medina, Nilberto Heder and Umisedo, Nancy Kuniko},
year = {2008},
publisher = {The Institute},
booktitle   = {International Symposium on the Natural Radiation Environment (NRE VIII)}
}