Patel, J. V., C. M. Mehta, N. G. Patil, and S. R. Sehgal. “Transverse Sacralization of Lumbar Vertebrae: Prevalence According to Castellvi Classification”. International Journal of Research in Orthopaedics, vol. 3, no. 1, Dec. 2016, pp. 116-21, doi:10.18203/issn.2455-4510.IntJResOrthop20164835.