1. NBR 6502/1995 — Terminologia — Rochas e Solos;ABNT Associação Brasileira de Normas Técnicas,1995
2. Table of radionuclides, Vol. 4 — A=133 to 252;Bé,2008
3. Table of radionuclides (Vol. 6 — A=22 to 242);Bé,2011
4. Sedimentary Geochemistry Petroleum Geoscience, Chapter 3;Bjørlykke,2010
5. Niveles de Cs-137 y Sr-90 en Muestras Ambientales de la Republica Argentina 1960–1980 Comision Nacional de Energia Nuclear, CNEA NT 9/81;Bruno,1981