1. Soil solution;Adams,1974
2. Estudio de las diferentes formas de aluminio presentes en solución de suelos de Galicia;Alvarez,1990
3. Geochemical aspects of aluminium in forest soils in Galicia (N.W. Spain);Alvarez;Biogeochemistry,1991
4. Aluminum toxicity to fish in acidic waters;Baker;Water Air Soil Pollut.,1982
5. Determination of reserve sulfur and solubles sulfates in soils;Bardseley,1960