1. D.L. Raberstein and R. Saetre, Anal. Chem., 49 (1977) 1036.
2. F. Krenzing and F. Frank, J. Chromatogr., 218 (1981) 615.
3. M.K. Halbert and R.P. Baldwin, J. Chromatogr., 345 (1985) 43.
4. F.E.P. Mikker, F.M. Everaerts and Th.P.E.M. Verheggen, J. Chromatogr., 169 (1979) 11.
5. J.W. Jorgenson and K.D. Lukacs, J. Chromatogr., 218 (1981) 209.