Pan, Z., Lie, D., Qiang, L., Shaolan, H., Shilai, Y., Yande, L., … Haiyang, P. (2016). Effects of citrus tree-shape and spraying height of small unmanned aerial vehicle on droplet distribution. International Journal of Agricultural and Biological Engineering, 9(4), 45–52. https://doi.org/10.25165/ijabe.v9i4.2178