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2. Cisternoatrial, ventriculocisternal, and other cisternal shunts simplified;Spetzler,1977
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4. Simplified percutaneous lumboperitoneal shunting;Spetzler;Surg Neurol,1977
5. New palliative operation in cases of inoperable occlusion of sylvian aqueduct;Torkildsen;Acta Chir Scand,1939