Sureerat Sriputtiban. (1999) Comparison of radon concentrations in dwellings and concrete product factories in Ubonratchathani. Mahidol University,:ม.ป.ท.Sureerat Sriputtiban. 1999. Comparison of radon concentrations in dwellings and concrete product factories in Ubonratchathani. ม.ป.ท.:Mahidol University,;Sureerat Sriputtiban. Comparison of radon concentrations in dwellings and concrete product factories in Ubonratchathani. ม.ป.ท.:Mahidol University, 1999. Print.