@misc{orgprints13548,
          editor = {Ir. G.J.H.M van der Burgt and Dr. B.G.H. Timmermans},
           title = {Soil Nitrogen: research and extension},
            year = {2008},
        keywords = {Nitrogen, soil, research, modelling},
             url = {http://orgprints.org/13548/},
        abstract = {These are the proceedings of the 4th QLIF workshiop with contributions of several European soil and nitrogen researchers.}
}