1. R.H. Stehl, Anal. Chem., 42 (1970) 1802.
2. P. Jandera and J. Churáćek, J. Chromatogr., 86 (1973) 423.
3. E.S. Jacobs and R.J. Passarelli, J. Chromatogr. Sci., 13 (1975) 153.
4. M. Singh, J. Assoc. Off. Anal. Chemists, 60 (1977) 173.
5. I.S. Kim, F.I. Sasinos, D.K. Rishi, R.D. Stephens and M.A. Brown, J. Chromatogr., 589 (1991) 177.