1. OJL 135 May 30, 1991, Directive 91/271/EC.
2. M. Jekel, Treatment of Wastewaters from Textile, Technische University Berlin, Kolloquium an der TU Berlin, 17–18 November 1997, Berlin 1997, pp. 3–12.
3. V. Novotny, H. Olem, Water Quality: Prevention, Identification and Management of Diffuse Pollution, Van Nostrand Reinhold, New York, 1994, p. 817.
4. A rapid biochemical test for measuring chemical toxicity