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2. Compression of the spinal cord in the neighbourhood of the foramen magnum;Symmonds, C.P.; Meadows, S.P.;Brain,1967
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4. Benign tumours of the foramen magnum;Meyer, F.B.; Ebersold, M.J.; Reese, D.F.;J Neurosurg,1984
5. Spinal meningiomas: clinical features;Harkev, H.L.; Crockard, H.A.,1991