ABDURRAHMAN, S. Karakteristik Subsemiring Fuzzy. Jurnal Fourier, [S. l.], v. 9, n. 1, p. 19–23, 2020. DOI: 10.14421/fourier.2020.91.19-23. Disponível em: https://fourier.or.id/index.php/FOURIER/article/view/95. Acesso em: 3 jul. 2022.