1. 1 APHA (1998 )Standard Methods for the Examination of Water and Wastewater20th edn. Washington, D.C.: American Public Health Association.
2. 2 V.J. Cabelli (1983 )Health effects criteria for marine waters. EPA 600/1-80-031, USEPA, Cincinnati, OH, USA.
3. 3 CNRIRSA (1994 )Metodi analitici per le acque, Istituto Poligrafico dello Stato.Roma: Consiglio Nazionale delle Ricerche-Istituto di Ricerca sulle Acque.
4. 4 W.R. Dillon, and M. Goldstein (1984 )Multivariate Analysis.New York: J. Wiley and Sons.