MARCHETTO, A.; MOSELLO, R.; TARTARI, G.; BIANCHI, M.; GEISS, H.; SERRINI, G.; SERRINI-LANZA, G.; MUNTAU, H. Performances of Analytical Methods for Freshwater Analysis Assessed through Intercomparison Exercises. II. Major Ions. J Limnol 1999, 58, 33-41.