@article{hanserud2015a,
  title = {A multi-regional soil phosphorus balance for exploring secondary fertilizer potential: the case of Norway}
  author = {Hanserud, Ola Stedje, and Brod, Eva, and Ødegaard, Anne Falk, and Müller, Daniel B., and Brattebø, Helge},
  journal = {Nutrient Cycling in Agroecosystems},
  doi = {10.1007/s10705-015-9721-6},
  year = {2015}
}