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Availability of phosphorus in cow slurry using isotopic labelling technique
Pichit Pongsakul, Finn Bertelsen and Gunn...
Bok Språk ikke angitt 1988
Control of selenium in plants
by Gunnar Gissel-Nielsen
Bok Engelsk 1977
Relationships between soil factors and selenium content of Danish soils and plants
A.A. Hamdy and G. Gissel-Nielsen
Bok Engelsk 1976