Yongqiang Chen, Wang He. Effects of the Quality and Safety Control of Gannan Navel Orange Adopted by Pollution-free Planting Technology ——Based on Propensity Score Matching. DE [Internet]. 2020Dec.30 [cited 2024May8];:728 -741. Available from: http://thedesignengineering.com/index.php/DE/article/view/1035