1. ASTM (1985) Annual Book of ASTM Standards. Part 31 Water. Ed. American Society for Testing and Materials. Philadelphia.
2. Ayora C, Bernet O, Bolzicco J, Carrera J, Dom�nech C, Cer�n JC, Fern�ndez I, Gomez P, Ja�n M, Mantec�n R, Manzano M, Mart�n Machuca M, Mediavilla C, Moreno L, Navarrete P, Salvany JM (2001) Hidrogeolog�a del Valle del Guadiamar y zonas colindantes. Funcionamiento del sistema acu�fero. Bolet�n Geol�gico Minero 112:69?92
3. Bollh�fer A, Rosman KJR (2001) Isotopic source signatures for atmospheric lead: the Northern Hemisphere. Geochim Cosmochim Acta 65:1,727?1,440
4. Borja F, L�pez Geta JA, Mart�n Machuca M, Mantec�n R, Mediavilla C, del Olmo P, Palancar M, Vives R (2001) Marco geogr�fico, geol�gico e hidrol�gico regional de la cuenca del Guadiamar. Bolet�n Geol�gico Minero 112:13?34
5. Erel Y, Veron A, Halicz L (1997) Tracing the sources of anthropogenic lead in the atmosphere and in soils using isotopic ratios. Geochim Cosmochim Acta 61:4,495?4,505