Lu, Thien Phuc, et al. “DEVELOPMENT AND VALIDATION OF A HPLC-DAD METHOD FOR DETERMINING THE PURITY OF ALLOPURINOL IMPURITY C”. Cantho Journal of Medicine and Pharmacy, no. 36, Aug. 2026, pp. 161-7, https://tapchi.ctump.edu.vn/index.php/ctump/article/view/900.