Yin, Baozhong, et al. “Soil Physical Properties, Nutrients, and Crop Yield With Two-Year Tillage Rotations under a Winter Wheat-Summer Maize Double Cropping System”. International Journal of Agricultural and Biological Engineering, vol. 15, no. 1, Feb. 2022, pp. 172-81, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/6855.