* Directive 91/676/EEC concerning the protection of waters against pollution caused by nitrates from agricultural sources. Official Journal of the European Communities, L 375/1, December 31, 1991.
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##### Mathieu O, Lévêque J, Hénault C, Milloux M-J, Bizouard F, Andreux F (2006)
* Emissions and spational variabiliy of N2O, N2 and nitrous oxide mole fraction at the field scale, revealed with 15N isotopic techniques. Soil Biol Biochem 38, 941-951
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* Auswirkungen von Bodenverdichtungen durch landwirtschaftliche Nutzung auf die N2- und N2O-Emissionen aus dem Boden. PhD Thesis Universität Hannover, Fachbereich Gartenbau, 130 p