YU, Ziguan. The Flatness of The Universe Through Theory and Observations. Highlights in Science, Engineering and Technology, [S. l.], v. 112, p. 314–318, 2024. DOI: 10.54097/b816cb51. Disponível em: https://drpress.org/ojs/index.php/HSET/article/view/24117. Acesso em: 26 aug. 2026.