Uyen, Dang.
" Caesium and Strontium Isotopes Concentrations in Some Enviromental Samples and Gamma Radiation Fields in (Hanoi, Haiphong and Viettri) Cities, North Vietnam, 1980 - 1990" <em>VNU Journal of Science: Mathematics - Physics</em> [Online], Volume 19 Number 1 (15 March 2003)