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2. C.B.S., 1995. Algemene milieustatistiek 1995, SDU uitgeverij, s’Gravenhage, The Netherlands, 340 pp.
3. Corpen, 1996. Estimation des rejets d’azote et de phosphore des élevages de porc. Ministère de l’Agriculture et Ministère de l’Environnement, 21 p.
4. European Union, 1991. Council directive 91/676/EEC of 12.12.1991 concerning the protection of waters against pollution caused by nitrates from agricultural sources.
5. Border between application and dumping of organic manure (in Dutch;Henkens;Bedrijfsontwikkeling,1975