N. Q. . Minh, L. T. . Mai, D. P. . Hiếu, V. T. . Hà, and L. H. . Doanh, “7. Results of treatment of crow’s feet with Botulinum toxin type A injection at the National Hospital of Dermatology”, TCNCYH, vol. 168, no. 7, pp. 57-66, Aug. 2023.