1. Water quality criteria for European freshwater fish report on combined effects on freshwater fish and other aquatic life of mixtures of toxicants in water;Alabaster;EIFAC,1980
2. Braukmann U. (1984) Biological contribution to a common regional typology of streams (Biologischer Beitrag zu einer allgemeinen regionalen Bachtypologie), Dissertation, Justus Liebig Universität Gießen.
3. Derivation of site-specific ammonia criteria for an effluent-dominated headwater stream;Diamond;Environ. Toxicol. Chem.,1993
4. EPA (U.S. Environmental Protection Agency), (1998) 1998 Update of ambient water quality criteria for ammonia. Office of Water 4303, EPA 822-R-98-008.
5. Biology of the Mideuropean Freshwater Snails (Biologie der mitteleuropäischen Süßwasserschnecken);Frömming,1956