Zhou, Sanzhang, et al. “Point Cloud Registration for Agriculture and Forestry Crops Based on Calibration Balls Using Kinect V2”. International Journal of Agricultural and Biological Engineering, vol. 13, no. 1, Mar. 2020, pp. 198-05, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/5077.