1. Supernumerary first rib;Willshire;Lancet,1860
2. Observations in 100 cases of cervical ribs;Torelli;Il Policlinico (sez. chir.),1933
3. Cervical rib;Adson;Ann. Surg.,1927
4. Brachial neuritis caused by pressure of first rib;Murphy;Australian M. J.,1910