1. Biological methods for the assessment of water quality;Cairns,1973
2. Biomonitoring for water quality determination. With particular reference to (semi)continuous monitoring systems;Oertel,1991
3. Biological monitoring and our water resources;Gruber;Endeavour, New Series,1989
4. Biological monitoring of the Aquatic Environment;Weber,1973
5. Heavy-metal Accumulation in Cladophora glomerata (L.) Kutz in the River Danube;Oertel;AMBIO,1991