Andersen, H. E., Heckrath, G.
, Hoffmann, C. C., Iversen, B. V., Jacobsen, O. H., Kjærgaard, C., Kronvang, B., Lægdsmand, M., Rubæk, G. H., Heckrath, G. (Ed.), Rubæk, G. H. (Ed.)
& Kronvang, B. (Ed.) (2007).
A phosphorus index approach for Denmark.
DJF Plant Science,
130, 255-258.