1. The program ESPEC for the analysis of gamma spectra of environmental samples;Baeza;Appl. Radiat. Isot.,1992
2. CRC Handbook of Chemistry and Physics, 1984. B-18, 64th Edition. CRC Press, Boca Ratón, FL.
3. ISO, International Standard, 10703:1997(E). Water quality-determination of the activity concentration of radionuclides by high resolution gamma-ray spectrometry.
4. UNSCEAR, United Nations Scientific Committee on the Effects of Atomic Radiation Ionizing Radiation, 1988. Sources, Effects and Risks of Ionizing Radiation. United Nations, New York.