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2. Use of ultrasound in neurosurgical operations: A preliminary report;Dohrmann;Surg Neurol,1981
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4. Cervical spondylosis and syringomyelia: Suboptimal results, incomplete treatment, and the role of intraoperative ultrasound;Dohrmann;Clin Neurosurg,1988
5. Spinal cord tumor imaging with CT and sonography;Enzmann;AJNR Am J Neuroradiol,1985