Mohamed Ali Elamin, Elsiddig. “Identifying Habitable Exoplanets Using the Earth and ‎‎Cosmic Harmonic Factor: Exoplanets”. Hyperscience International Journal 3, no. 1 (March 3, 2023): 1–4. Accessed May 6, 2024. https://hscience.org/index.php/hij/article/view/89.