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Kulig, Kornelia; Landel, Robert F.; Powers, Christopher M. . (2004). Assessment of Lumbar Spine Kinematics Using Dynamic MRI: A Proposed Mechanism of Sagittal Plane Motion Induced by Manual Posterior-to-Anterior Mobilization. Journal of Orthopaedic & Sports Physical Therapy, 34(2), 57–64. doi:10.2519/jospt.2004.34.2.57 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research