Literaturrecherche

Literatur Dirksmeyer W (2006) Economics of pesticide reduction and biological control in field vegetables : a cross country comparison. Kiel: Wissenschaftsverl Vauk, XXVII, 246 p, Landwirtsch Umwelt 21

Literatur Brouwer F, Kleinhanß W (eds) (1997) The implementation of nitrate policies in Europe : processes of change in environmental policy and agriculture. Kiel: Wissenschaftsverl Vauk, VII, 285 p, Landwirtsch Umwelt 14