1.Angst M., Ramaswamy B., Riley E., Stanski D. Lumbar epidural morphine in humans and supraspinal analgesia to experimental heat pain // Anesthesiology. 2000; 92: 312-324.2.Bernards C., Hill H. Physical and chemical properties of drug molecules governing their diffusion through the spinal meninges. // Anesthesiology. 1992; 77: 750-756.3.Bernards S., Sorkin L. Radicular artery blood flow does not redistribute fentanil from epidural space to the spinal cord // Anesthesiology. 1994; V: 872-878.4.Broadbent C., Maxwell W., Ferrie R. Ability of anesthesist to identify a marked lumbar interspace // Anaesthesia. 2000; 55: 1045-1046.5.Carpenter R., Hogan Q., Liu S. Lumbosacral cerebrospinal fluid volume is the primary determinant of sensory block extent and duration during spinal anesthesia. // Anesthesiol. 1998; 89: 24-29.6.Cousins M., Bridenbaugh P. Neural Blockade in Clinical Anesthesia and Management of Pain, 3-rd ed., Philadelphia: Lippincott Williams & Wilkins, 1998.7.Crighton I., Barry B., Hobbs G. A study of the anatomy of the caudal space using magnetic resonance imaging // Br. J. Anaesth. 1997; 78: 391-395.8.Hogan Q. Lumbar epidural anatomy. A new look for cryomicrotome section. // Anesthesiology. 1991; 75: 767-775.9.Igarashi T., Hirabayashi Y., Shimizu R. The epidural structure changes during deep breathing // Can. J. Anaesth. 1999; 46: 850-855.10.Meijenghorst G. Computed tomography of lumbar veins // Radiology. 1982; 145: 687-691.11.Reynolds F. Logic in the safe practice of spinal anaesthesia // Anaesthesia. 2000; 55: 1045-1046.12.Yamashima T. Functional ultrastructure of cerebrospinal fluide drainage channels in human arachnoid villi. // Neurosurgery. 1988; 22: 633-641.