Van Bol, V., & Peeters, A. (1997). Nitrogen resources conservation in a mixed dairy farming system - Winter leachable nitrate risk assessment. Proc. of the European Newsletter of Organic Farming (NENOF), Ancona 5-6 June 1997,49,352. Published. https://hdl.handle.net/2078.5/150764 (Original work published 1997)