Niklasson , F., J. Hetta, and I. Degrell. “Hypoxanthine, Xanthine, Urate and Creatinine Concentration Gradients in Cerebrospinal Fluid”. Upsala Journal of Medical Sciences 93, no. 3 (September 1, 1988): 225-232. Accessed April 8, 2026. https://ujms.net/index.php/ujms/article/view/6833.