Hartvig Per, Gustafsson Lars L., Bergström Kjell, Moström Ulf, Pontén Urban, Lindberg Bo, and Lundqvist Hans. 1987. “Positron Emission Tomography: An Animal Model of Spinal Distribution of Drugs After Intrathecal Administration”. Upsala Journal of Medical Sciences 92 (2):205-13. https://doi.org/10.3109/03009738709178690.