Gao, Jianmin, et al. “Development and Experiments of Low Frequency Ultrasonic Electrostatic Atomizing Nozzle With Double Resonators”. International Journal of Agricultural and Biological Engineering, vol. 15, no. 4, Sept. 2022, pp. 39-48, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/6251.