RAIKOS, A.; PARASKEVAS, G. K.; TRIARIDIS, S.; KORDALI, P.; PSILLAS, G. & BRAND-SABERI, B. Bilateral supernumerary sternocleidomastoid heads with critical narrowing of the minor and major supraclavicular fossae: clinical and surgical implications. Int. J. Morphol., 30(3):927-933, 2012.