1. Adeloju, S.B., Bond, A.M. and Briggs, M.H., 1985, Multielement determination in biological materials by differential pulse voltammetry, Anal. Chem., 57: 1388–1390.
2. Apel, M. and Stoeppler, M., 1983, Speciation of arsenic in urine of occupationally nonexposed persons, in: Proc. Int. Conf. Heavy Metals in the Environment, Heidelberg, Vol. 1., pp. 517–520, CEP Consultants, Edinburgh.
3. Aitio, A. and Jarvisalo, J., 1984, Collection, processing and storage of specimens for biological monitoring of occupational exposure to toxic chemicals, Pure Appl. Chem., 56: 549–566.
4. Barnes, I.L., Murphy, T.I. and Michiels, E.A.I., 1982, Certification of lead concentration in standard reference materials by isotope dilution mass spectrometry, J. Assoc. Off. Anal. Chem., 65: 953–956.
5. Berger, H., Meyberg, F. and Dannecker, W., 1986, Influences of typical environmental matrices on the analysis of trace elements with graphite tube furnace AA, in: “Fortschritte in der atomspektroskopisehen Spurenanalytik,” B. Welz, ed., Verlag Chemie, Weinheim.