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Patel, Vikas V., Pierce D. Nunley, Peter G. Whang, Thomas R. Haley, W Daniel Bradley, Raphael P. Davis, Jon E. Block, and Fred H. Geisler. "Superion(®) InterSpinous Spacer for Treatment of Moderate Degenerative Lumbar Spinal Stenosis: Durable Three-year Results of a Randomized Controlled Trial." J Pain Res 2015.

Patel, Vikas V., et al. "Superion(®) InterSpinous Spacer for Treatment of Moderate Degenerative Lumbar Spinal Stenosis: Durable Three-year Results of a Randomized Controlled Trial." J Pain Res 2015.