Hartvig P.; Gustafsson L. L.; Bergström K.; Moström U.; Pontén U.; Lindberg B.; Lundqvist H. Positron Emission Tomography: An Animal Model of Spinal Distribution of Drugs after Intrathecal Administration. Upsala Journal of Medical Sciences, v. 92, n. 2, p. 205-213, 1 Sep. 1987.