1. ACGIH ( 1996 ).Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices.American Conference of Governmental Industrial Hygienists , Cincinnati , p. 45 .
2. Bancroft , H. ( 1957 ).Introduction to Biostatistics, Hoeber-Harper , New York , p. 98 .
3. Respirable Aerosol Sampler Performance Testing
4. Health and Safety Executive Report IR/L/DS/89/3;Berry R.,1989
5. Performance Characteristics of the Multicyclone Aerosol Sampler