1. Alpaugh EL (1982) in Olishifski (Ed) Fundamentals of industrial hygiene. National Safety Council, Chicago, Ill, USA, 4th edn, p 171
2. Clayton GD, Clayton FE (1981) Patty's Industrial Hygiene and Toxicology, Wiley Interscience, New York
3. Santamaria J, Fernandez M, Mendez J, Bomboi MT (1990) Fresenius J Anal Chem 337:362?365
4. Schmalz J (1982) Staub-Reinhaltung der Luft 42:343?346
5. Hlavay J, Inczédy J (1985) Spectrochim Acta 41 A:783?787