@article{yanlin_zijun_liang_2020,  title={Temporal-spatial differences in and influencing factors of agricultural eco-efficiency in Shandong Province, China},  volume={50},  ISSN={0103-8478},  url={https://doi.org/10.1590/0103-8478cr20190818},  DOI={10.1590/0103-8478cr20190818},  number={7},  journal={Ciência Rural},  publisher={Universidade Federal de Santa Maria},  author={Yanlin, Xu and Zijun, Li and Liang, Wang},  year={2020},  pages={e20190818} }