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Naderi-Boldaji, Mojtaba; Weisskopf, Peter; Stettler, Matthias; Keller, Thomas (2016). Predicting the relative density from on-the-go horizontal penetrometer measurements at some arable top soils in Northern Switzerland Soil and Tillage Research, 159, pp. 23-32. Elsevier 10.1016/j.still.2015.12.002
