Wang, Wensen, et al. “Effects of Drought Stress on Photosynthesis and Chlorophyll Fluorescence Images of Soybean (Glycine Max) Seedlings”. International Journal of Agricultural and Biological Engineering, vol. 11, no. 2, Mar. 2018, pp. 196-01, https://www.ijabe.org/index.php/ijabe/article/view/3390.