1. Markfysikaliska undersökningar i odlad jord, VIII. En experimentell metod;Andersson;Grundförbättring,1955
2. Arvidsson, J., Feiza, V., 1995. Låga ringtryck i odling med och utan plöjning. Internal report 18, Division of Soil Management, Swedish University of Agricultural Sciences, Uppsala (in Swedish, with English summary).
3. Tillage effect on shear strength and bulk density of soil aggregates;Benjamin;Soil Tillage Res.,1987
4. Effects of crop rotation and residue management practises on severity of tan spot of winter wheat;Bockus;Plant Dis.,1992
5. Bowen, H.D., 1981. Alleviating mechanical impedance. In: Arkin, G.F., Taylor, H.M. (Eds.), Modifying the Root Environment to Reduce Crop Stress, ASAE Monograph No. 4. Am. Soc. Agr. Engineers, St Joseph, MI, pp. 21–57.