Armijos Briones FM, Castillo González JI, Armijos Moreta JF, Boada Zurita CDR. Treatment Alternatives to Gingival Hyperpigmentation using Neutrosophic Correlation Coefficients. Neutrosophic Sets Syst. 2022;52:319-325. Accessed June 1, 2025. https://fs.unm.edu/nss8/index.php/111/article/view/2664