1. Health hazards associated with hairdressing;Dahl,1991
2. NEN 6472. Water - Photometric determination of ammonium content;Dutch Normalisation Institute,1983
3. NVN 2941. Air quality - Workplace atmosphere - Standard practice for the determination of organic vapors or gases by gas diffusive sampling with a dosimeter, liquid desorption and gas chromatography;Dutch Normalisation Institute,1988
4. NVN 2947. Air quality - Workplace atmosphere - Standard practice for the determination of toxic vapors or gases by active sorbent tube sampling, liquid desorption and gas chromatography;Dutch Normalisation Institute,1990
5. Occupational exposure limits;HSE (Health and Safety Executives),1995