Akaho, Eiichi. “A Review on Gravity, Antigravity, and Gravitational Shielding Along With Related Prospective Viewpoints and Possible Practical Applications”. IJRDO-Journal of Applied Science 5, no. 8 (August 21, 2019): 35-68. Accessed December 22, 2024. https://ijrdo.org/index.php/as/article/view/3129.