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2. 91/271/EEC. Council Directive 91/271/EEC of 21 May 1991 concerning urban waste-water treatment. Official Journal 135, 40-52. https://eur-lex.europa.eu/eli/dir/1991/271/oj.
3. 91/676/EEC. Council Directive 91/676/EEC of 12 December 1991 concerning the protection of waters against pollution caused by nitrates from agricultural sources. Official Journal 375, 1-8. https://eur-lex.europa.eu/eli/dir/1991/676/oj.
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