13. R.P.W.Scott and P.Kucera, J.Chromatogr 149(1978)93.

14. R. P. W. Scott and S. Traiman

15. R.P.W.Scott and P.Kucera, J.Chromatogr 149(1978)93.

16. R. P. W. Scott and P. Kucera, J. Chromatogr., 125(1976)251.

17. D. N. Northrop, R. P. W. Scott and Daniel E. Martire, Anal.

Chem. 63(19911354

18. D. Gil-Av, B. Feibush and R. Charles-Sigler, Tetrahedron

Lett.(1988)1009.

19. E. Koch, G. J. Nicholsonand E. Bayer, J. High. Resol.

Chromatogr., 7(1984)398.

20. W. H. Pirkle and D. W. House, J. Org. Chem., 44(1979)1957.

21. Y. Okamato, Chem. Lett., (1986)1237.

22. D. W. Armstrong, Y. Tang, S. Chen, Y. Zhou, C. Bagwill, and

J. R. Chen, Anal. Chem., 66(9)(1994)1473.

23. M. Otagiri, T. Mivaji, K. Uekama and K. Ikeda, Chem. Pharm.

Bull. (Toyko), 254(1976)1146.

24. D. W. Armstrong, W. Li and C. D. Chang, Anal. Chem.,

62(1990)914.