Michael W. I. Schmidt

Improvement of 13C and 15N CPMAS NMR spectra of bulk soils, particle size fractions and organic material by treatment with 10% hydrofluoric acid

I. Kögel‐Knabner, P. Hatcher, H. Knicker, 1997 .

Charred organic carbon in German chernozemic soils

Ingrid Kögel-Knabner, J. Skjemstad, I. Kögel‐Knabner, 1999 .