Xayheungsy, S., N. C. Thanh, L. D. Nam, V. H. Giang, and L. H. Khiem. “MEASUREMENT OF NATURAL RADIOACTIVITY IN SOME SAND AND BRICK IN VIETIANE PROVINCE, LAO PDR”. IJRDO-Journal of Applied Science, Vol. 4, no. 11, Nov. 2018, pp. 11-19, doi:10.53555/as.v4i11.2533.