He, Fen, Yong Hou, Kai Li, Xiaoming Wei, and Yaqing Liu. 2020. “Investigation of a Root Zone Heating System for Greenhouse Seedling and Its Effects on Micro-Environment”. International Journal of Agricultural and Biological Engineering 13 (6):47-52. https://ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/5905.