Lu, En, et al. “Adaptive Backstepping Control of Tracked Robot Running Trajectory Based on Real-Time Slip Parameter Estimation”. International Journal of Agricultural and Biological Engineering, vol. 13, no. 4, Aug. 2020, pp. 178-87, https://ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/5739.