Pham Xuan, Hai, et al. “RESEARCH ON RADON CONCENTRATION IN THE HOUSES BUILT WITH SEVERAL POPULAR MATERIALS IN DA LAT CITY, LAM DONG PROVINCE”. Ho Chi Minh City University of Education Journal of Science, vol. 21, no. 12, Dec. 2024, p. 2159, doi:10.54607/hcmue.js.21.12.4073(2024).