1. Commission of the European Communities, A Comprehensive List of Polluting Substances which have been Identified in Various Fresh Waters, Effluent Discharges, Aquatic Animals, Plants, and Bottom Sediments, EUCO/MDU/73/76, XII/476/76, Brussels, 2nd ed., 1976
2. Verordnungu¨ber Trinkwasser undu¨ber Brauchwasser fu¨r Lebensmittelbetriebe (Trinkwasser-Verordnung), Bundesgesetzblatt Teil I, Z 1997 A, Nr. 16, 1975 S. 453