WONG, Wing-hong, Wing-to WONG, Wing-keung WONG, and Ling-mei WONG. “An Interpretation of the Hubble Expansion by the Antigraviton-Graviton Theory”. International Journal of Advanced Astronomy 2, no. 2 (July 12, 2014): 23–26. Accessed May 7, 2024. https://sciencepubco.com/index.php/IJAA/article/view/2782.