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J. Bachmann; K. Contreras; K.H. Hartge; R. MacDonald. (2006).
Comparison of soil strength data obtained in situ with penetrometer and with vane shear test. , 87(1), 112–118.
doi:10.1016/j.still.2005.03.001
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research
