@book{Kern2014, author = {J{\"u}rgen (Redakt.) Kern}, title = {Phosphor f{\"u}r die Landwirtschaft - Strategien f{\"u}r eine endliche Ressource}, series = {Workshop, 11. Juni 2014, Potsdam-Bornim}, isbn = {0947-7314}, year = {2014}, }