Elveña, JCA and KHA Villegas 2025. Solutions to the Dirac equation in a universe with a spacetime-anti-spacetime boundary. Proceedings of the Samahang Pisika ng Pilipinas (Philippines, 2025), SPP-2025-2F-03. URL: https://proceedings.spp-online.org/article/view/SPP-2025-2F-03.