1. Revised European standard series from 1 January 1989;Contact Dermatitis,1988
2. List of dangerous substances. order No. 805 of 15 December 1989. National Agency of Environmental Protection 1989
3. List of dangerous substances. 19 January 1983 changes 29 Statens Forurensningstilsyn 1986
4. List of allergenic substances 1 July 1986: changes from February 1990. Kemikalicin-spektionen 1990
5. Order on classification and labelling of dangeorus substances 1988