He, Jie, et al. “Impacts of LED Spectral Quality on Leafy Vegetables: Productivity Closely Linked to Photosynthetic Performance or Associated With Leaf Traits?”. International Journal of Agricultural and Biological Engineering, vol. 12, no. 6, Dec. 2019, pp. 16-25, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/5178.