1. Th. Godish, Air Quality, Lewis Publishers, USA, 1985.
2. E. Berman, Toxic Metals and Their Analysis, Heyden and Son, London, 1980.
3. C. Vandecasteele, C.B. Block, Modern Methods for Trace Element Determination, Wiley, Chichester, 1993.
4. Speciation of lead in environmental and biological samples, Technical report, 1995 IUPAC;Baxter;Pure Appl. Chem.,1995
5. N.I. Ward, Trace elements, in: F.W. Fifield, P.J. Haines, Blackie, Environmental Analytical Chemistry, Academic and Professional, London, 1995.