HASAN, Ameer Mohammed Hussein. Soft Pre-Open Sets In Soft Bitopological Spaces. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 26, n. 4, p. 42–53, 2016. Disponível em: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/2059. Acesso em: 24 sep. 2025.