HASAN, A. M. H. Soft Pre-Open Sets In Soft Bitopological Spaces. American Scientific Research Journal for Engineering, Technology, and Sciences, [S. l.], v. 26, n. 4, p. 42–53, 2016. Disponível em: https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/2059. Acesso em: 3 may. 2024.