Precautionary principle Author Wolfrum R. Date 1998 Source IUCN (ID: MON-063834) Publisher | Place of publication unpublished Pages 12 p. Document type Conference, symposium etc. document/report Conference name | place | date European Council Conference on Environmental Law | Lisbon | 19980918 -19980919 Language English Field of application International Subject Environment gen. Keyword Precautionary principle