Trung, Trần Huỳnh, Lê Nguyên Lâm, and Phạm Anh Vũ Thuỵ. 2026. “Histological Survey of Gingival Hyperpigmentation”. Journal of Medical Research 199 (2):660-66. https://doi.org/10.52852/tcncyh.v199i2.4712.