T. P. Lu, L. T. Tran, T. H. Nguyen, T. P. T. Nguyen, and T. N. Lam, “DEVELOPMENT AND VALIDATION OF A HPLC-DAD METHOD FOR DETERMINING THE PURITY OF ALLOPURINOL IMPURITY C”, CTJUMP, no. 36, pp. 161–167, Aug. 2026.