Elaboration of the scientific bases for monitoring the quality of surface water by hydrobiological indicators : report of the first UK/USSR seminar held at Valdai, USSR 12th-14th July 1976 /
Lund, John W. G.
Vinberg, G. G.
Great Britain.Central Unit on Environmental Pollution.
London : Dept. of the Environment, Central Unit on Environmental Pollution,
1978.