Peng, Hui. “Spin-Electromagnetics and Spin-Gravity Vs Spin-Electromagnetics-Force and Spin-Gravity-Force (5th Force?)”. European Journal of Applied Sciences 14, no. 03 (June 29, 2026): 546–561. Accessed July 24, 2026. https://scholarpublishing.org/journals/index.php/EJAS/article/view/11959.