Qiao, C., Su, P., & Huang, Y. (2025). A general discussion on photon spheres in different categories of spacetimes. SpringerOpen.
Chicago Style (17th ed.) CitationQiao, Chen-Kai, Ping Su, and Yang Huang. A General Discussion on Photon Spheres in Different Categories of Spacetimes. SpringerOpen, 2025.
MLA (9th ed.) CitationQiao, Chen-Kai, et al. A General Discussion on Photon Spheres in Different Categories of Spacetimes. SpringerOpen, 2025.
Warning: These citations may not always be 100% accurate.