López, R. N.; Segovia, N.; Cisniega, M. G.; López , M. B. E.; Armienta, M. A.; Seidel, J. L.; Peña, P.; Godínez, L.; Tamez, E. Determination of Radon, Major and Trace Elements in Water Samples from Springs and Wells of Northern Mexico State, Mexico. Geofis Int 2002, 41, 407-414.