“Comparative Study of Chicken Liver Xanthine Dehydrogenase and Bovine Liver Xanthine Oxidase. Dehydrogenase Activity of Xanthine Oxidase”. Revista Española De Fisiología, vol. 35, no. 1, Mar. 1979, pp. 51-62, https://revistas.unav.edu/index.php/ref/article/view/49669.