Tani S, Yamada S, Knighton R : Extensibility of the lumbar and sacral cord-Pathophysiology of the tethered spinal cord in cats. J Neurosurgery 66 : 116-123, 1987
Smith CG : Changes in length and position of the segments of the spinal cord with changes in posture in the monkey. Radiology 66 : 259-266, 1956
Yuan Q, Cougherty L, Margulines SS : In vivo human cervical spinal cord deformation and displacement in flexion. Spine 23 : 1677-1683, 1998