1.
Hass J, Kirby R. Characterizing the 4-sphere, S^4. J. Open Math. Prob. [Internet]. 2025 Aug. 12 [cited 2026 Aug. 24];1(1):52-68. Available from: https://ticket17180.pkpmisc01.publicknowledgeproject.org/index.php/jomp/article/view/Vol-1Issue-1Paper-3