Van Tao, C., M. Van Nhon, and T. Hoa Lang. “DESIGNING THE POSITRON FIT PROGRAM TO CACULATE ANNIHILATION PARAMETERS OF POSITRON IN METALS AND ALLOYS”. Science and Technology Development Journal, Vol. 7, no. 8, Aug. 2004, pp. 32-37, doi:https://doi.org/10.32508/stdj.v7i8.3240.