Bijukachhe, B., B. Shrestha, J. Pandey, and A. Banskota. “Free Hand Insertion of Pedicle Screws in Dorsal / Lumbar / Sacral Spine – Our Experience”. Nepal Orthopaedic Association Journal, vol. 2, no. 1, May 2013, pp. 35-42, https://nepjol.info./index.php/NOAJ/article/view/8138.