@article{Breuning Madsen_1985, title={A. J. Koolen, H. Kuipers: Agricultural soil mechanics. (Advanced series in agricultural sciences, 13).}, volume={85}, url={https://tidsskrift.dk/geografisktidsskrift/article/view/44097}, journal={Geografisk Tidsskrift}, author={Breuning Madsen, Henrik}, year={1985}, month={jan.} }