LYU, C., D. TANG, K. ZHANG, and J. WANG. “Influence of Ridges for Planting Sweet Potato on Symbiotic Ecological Factors, Photosynthetic Abilities and Population Yield in Relay Intercropping System”. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, vol. 48, no. 2, June 2020, pp. 849-61, doi:10.15835/nbha48211837.