1. A modified single solution method for the determination of phosphate in natural waters
2. A.E. Greenberg, R.R. Trussell, L.S. Clersceri (Eds.), Standard Methods for Examination of Water, 16th Edition, American Public Health Association, Baltimore, 1985.
3. Nutrients salts in Galician rias;Prego;Technical Reports of Scientia Marina,1990
4. J. Vergara, R. Prego, VII Seminario Ibérico de Quı́mica Marina. De, R. Prego and J.M. Fernández Álvarez, ISBN 84-89690-27-8, 1997.
5. A Multicolumn Ion Chromatographic Determination of Nitrate and Sulfate in Waters Containing Humic Substances