@article{yang_bian_zhang_xiong_lei_2015,  title={Quantitative Assessment of Soil Physical Quality in Northern China Based on S-theory},  volume={39},  ISSN={0100-0683},  url={https://doi.org/10.1590/01000683rbcs20150030},  DOI={10.1590/01000683rbcs20150030},  number={5},  journal={Revista Brasileira de Ciência do Solo},  publisher={Sociedade Brasileira de Ciência do Solo},  author={Yang, Dejun and Bian, Zhengfu and Zhang, Kefeng and Xiong, Jibing and Lei, Shaogang},  year={2015},  month={Sep},  pages={1311–1321} }