ABDURRAHMAN, S. Interior Subgrup Fuzzy. Jurnal Fourier, [S. l.], v. 7, n. 1, p. 13–21, 2018. DOI: 10.14421/fourier.2018.71.13-21. Disponível em: https://fourier.or.id/index.php/FOURIER/article/view/73. Acesso em: 5 oct. 2025.