Bertalanffy H, Seeger W : The dorsolateral, suboccipital, transcondylar approach to the lower clivus and anterior portion of the craniocervical junction. Neurosurgery 29 : 815-821, 1991.
Samii M, Gerganov V, Samii A : Improved preservation of hearing and facial nerve function in vestibular schwannoma surgery via the retrosigmoid approach in a series of 200 patients. J Neurosurg 105: 527-535.2006.