@misc{misc3867c23b,
title   = {The Study of natural radiation distribution in},
author = {Matsumoto, M M and Silveira, M A G and Medina, N. H. and Umisedo, Nancy Kuniko},
year = {2008},
publisher = {The Institute},
booktitle   = {International Symposium on the Natural Radiation Environment (NRE VIII)}
}