Wang, Chunmei, Zhang Song, Jinchao Qian, and Yingying Wang. “Research on Structure Design of Soil Hardness Penetrameter”. Highlights in Science, Engineering and Technology 48 (May 16, 2023): 74–78. Accessed April 29, 2026. https://drpress.org/ojs/index.php/HSET/article/view/8254.