NIKLASSON , F.; HETTA , J.; DEGRELL , I. Hypoxanthine, Xanthine, Urate and Creatinine Concentration Gradients in Cerebrospinal Fluid. Upsala Journal of Medical Sciences, [S. l.], v. 93, n. 3, p. 225–232, 1988. DOI: 10.3109/03009738809178548. Disponível em: https://ujms.net/index.php/ujms/article/view/6833. Acesso em: 15 nov. 2026.