Tanaka, Tadashi, and Hans K. Uhthoff. “The Pathogenesis of Congenital Vertebral Malformations: A Study Based on Observations Made in 11 Human Embryos and Fetuses”. Acta Orthopaedica 52, no. 4 (January 1, 1981): 413–425. Accessed April 27, 2026. https://actaorthop.org/actao/article/view/28848.