Schonstrom, N. S. R., Bolender, N. F., Spengler, D. M.: The pathomorphology of spinal stenosis as seen on CT scans of the lumbar spine. Spine, 10: 806-811, 1985.
Postacchini, F., Amatruda, A., Morace, G. B., et al.: Magnetic resonance imaging in the diagnosis of lumbar spinal canal stenosis. Ital J Orthop Trauma, 17: 327-337, 1991.