Skull base chordomas: endonasal endoscopic transclival approach - Raper, D MS; Komotar, R J; Fraser, J F; Anand, V K; Moore, N; Schwartz, T H (Astrocytoma, Medulloblastoma, Retinoblastoma, Chordoma, Craniopharyngioma, Oligodendroglioma, and Ependymoma, 2012)
. Tumors of the Central Nervous System; vol 8