1. J. F. M. Nouws,Arch. Lebensmittelhyg. 1981,32, 103.
2. E. H. Allen,J. Assoc. Off. Anal Chem. 1985,68, 990.
3. R. B. Ashworth,J. Assoc. Off. Anal. Chem. 1985,68, 1013.
4. B. Shaikh, E. H. Allen,J. Assoc. Off. Anal. Chem. 1985,68, 1007.
5. R. J. Heitzman, in:Drug Residues in Animals (A. G. Rico, ed.), Academic Press, Orlando/London, 1986, p. 205.