Conference on the Rehabilitation of Severely Damaged Land and Freshwater Ecosystems in Temperate Zones (1976 : Reykjavík, Iceland)
New York : Plenum Press, [1978]
International Workshop on Periphyton of Freshwater Ecosystems (1st : 1982 : Växjö, Sweden)
The Hague ; Boston : Junk ; Hingham, MA : Distributors for the U.S. and Canada, Kluwer Boston, 1983.