1. H. Martens and J.M. Harries, in H. Martens and H. Russwurm Jr Ed., “Food research and data analysis”, Applied Science Publ., Barking (U.K.) (1983).
2. M. Castino, Att Acc. It. Vite e Vino, 27 (1975) pp. 3.
3. I. Smeyers-Verbeke, D.L. Massart and D. Coomans, J. Ass. Off. Anal. Chem., 60 (1977) pp. 1382–85.
4. B.E.H. Saxberg, D.O. Duewer, J.L. Booker and B.R. Kowalski, Anal. Chim. Acta, 103 (1978) pp. 1382–85.
5. M. Forina and E. Tiscornia, Ann. Chim., 72 (1982) pp. 143.