Hakan Tuna, Nurettin Taştekin, Ercüment Ünlü, Tevfik Fikret Çermik, and Kenan Sarıdoğan, “Pelvic Rib: Developmental Anomaly, A Case Report”, Archives of Rheumatology, vol. 23, no. 4, pp. 151–153, Dec. 2008.