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2. DEV L1-DIN EN ISO 5667-16 (1998) Water quality — Sampling — Part 16::Guidance on biotesting of samples (ISO 5667-16:1998). Edited by Wasserchemische Gesellschaft-Fachgruppe in der Gesellschaft Deutscher Chemiker in Gemeinschaft mit dem Normenausschuß Wasserwesen (NAW) im DIN Deutsches Institut für Normung e.V., Beuth Verlag, Berlin, Germany.
3. DEV L30-DIN 38 412 Part 30 (1989) German standard methods for the examination of water, waste water and sludge — Determination of the non-poisonous effect of waste water to Daphnia by dilution limits, Beuth Verlag, Berlin.
4. DEV L33-DIN 38 412 Part 33 (1991) German standard methods for the examination of water,waste water and sludge — Determination of the non-poisonous effect of waste water to green algae (Scenedesmus chlorophyll fluorescence test) by dilution limits, Beuth Verlag, Berlin.
5. DEV L34-DIN EN ISO 11348-3 (1998) Water quality — Determination of the inhibitory effect of water samples on the light emission of Vibrio fischeri (Luminescent bacteria test)-Part 3:Method using freeze-dried bacteria, Beuth Verlag, Berlin.