Chavasiri, C., Chavasiri, S. . and Unnanantana, A. . (1999) “Single Level of Posterior Closing-Wedge and Anterior Extension Lumbar Osteotomy for Ankylosing Spondylitis”, Siriraj Medical Journal, 51(7), pp. 485–491. Available at: https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/247008 (Accessed: 2 May 2024).