@article{articlee448a2fe,
title   = {Radon exhalation from phosphogypsum building boards: symmetry constraints, impermeable boundary conditions and numerical simulation of a test case},
author = {Rabi, José Antonio and Silva, Nivaldo Carlos da},
year = {2006},
doi = {10.1016/j.jenvrad.2005.08.004},
journal   = {Journal of Environmental Radioactivity}
}