1. V. Valković,Trace Elements in Human Hair, Garland Publishing, New York, NY, 1977.
2. M. Anke and M. Risch,Haaranalyse und Spurenelementen Status, Gustav Fischer Verlag, Jena, 1979.
3. A. C. Brown and R. G. Crounse, eds.,Hair, Trace Elements and Human Illness, Proc. of the Second Human Hair Symposium, Atlanta, Georgia, Oct. 13–15, 1978 (Preager, New York, NY, 1980).
4. G. Chittleborough,Sci. Total Environ. 14, 53 (1980).
5. J. W. Copins Peereboom,Trace Elements, Health and Hair Analysis, Proc. Int. Symp., Amsterdam, 1982.