1. Anke M, Risch M (1979) Haaranalyse und Spurenelementen Status. Gustav Fischer Verlag, Jena
2. Boss AJJ (1984) The application of micro-PIXE in measuring trace elements in human hair. PhD Thesis, University of Amsterdam
3. Boss AJJ, Van der Stap CCAH, Vid RD, Valković V (1983) The measurement of position dependent element concentration with micro-proton induced X-ray emission. Spectrochimica Acta 38B:1209–1215
4. Boss AJJ, Vis RD, Lenglet W, Verheul H (1983) Trace element analysis of human hair by proton induced X-ray spectroscopy. In: Brätter P, Schramel P (ed) Trace element-analytical chemistry in medicine and biology, Vol. 2, Walter de Gruyter & Co, Berlin-New York
5. Brown AC, Crounse RG (1980) Eds. Hair Trace Elements in Human Illness. In: Proc. of the Second Human Hair Symposium, Atlanta, Georgia