Zhao, Xiaoshun, et al. “Electronic Control Seed-Metering System for Precision Seeding Maize Based on Fuzzy PID”. International Journal of Agricultural and Biological Engineering, vol. 17, no. 4, Sept. 2024, pp. 217-26, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/8247.