1. T. Almgren, B. Josefsson and G. Nyquist, Anal.Chim.Acta, 78(1975)411
2. G. Eklund, B. Josefsson and C. Roos, J. High Resol. Chromatogr. Chromatogr.Comm., (1)(1978)34
3. A.A. Nicholson and O. Meresz, Bull.Environ.Contam.Toxicol., 14(1975)453
4. A.A. Nicholson, O. Meresz and B. Lemyk, Anal.Chem., 49(1977)814
5. S. Folestad, L. Johnson, B. Josefsson, S. Lagerkvist, P. Lindroth, G. Nyquist, Proceedings, European Symposium on Micropollutant in Water, Berlin FRG 1979