Hu, Hongnan, Caiyun Lu, Qingjie Wang, Hongwen Li, Jin He, Dijuan Xu, and Xianliang Wang. 2018. “Influences of Wide-Narrow Seeding on Soil Properties and Winter Wheat Yields under Conservation Tillage in North China Plain”. International Journal of Agricultural and Biological Engineering 11 (4). Beijing, China:74-80. https://www.ijabe.org/index.php/ijabe/article/view/3399.