@book{92656,
	author = {Symposium on Ecological Indicators for the Assessment of the Quality of Air, Water, Soil and Ecosystems, Utrecht, Oct.1982},
	title = {Ecological indicators for the assessment of the quality of air, water, soil and ecosystems; papers presented/},
	publisher = {D.Reidel},
	year = {1983},
	address = {Dordrecht}
}