1. ASABE, 2019. ASAE Standard EP542. 1 NOV2019: Procedures for using and reporting data obtained with the soil cone penetrometer.
2. ASAE S313. 3: Soil Cone Penetrometer;Asabe, S.,2011
3. Theory of Land Locomotion: The Mechanics of Vehicle Mobility;Bekker,1956
4. Bekker, M.G., 1960. Off-the-Road locomotion. Research and Development in Terramechanics.
5. Bekker, M.G., 1969. Introduction to terrain-vehicle systems. Part i: The terrain. Part ii: The vehicle.