@article{Holm Jakobsen_1993, title={Humus, its structure and role in agriculture and environment. Proceedings of the 10th symposium humus et planta, held in Prague August 1991. J. Kubát (ed.). - (Developments in agricultural and managed-forest ecology; 25).}, volume={93}, url={https://tidsskrift.dk/geografisktidsskrift/article/view/42244}, journal={Geografisk Tidsskrift}, author={Holm Jakobsen, Bjarne}, year={1993}, month={jan.} }