Keskin, S., et al. “Characterization of a Polyphenol Oxidase Having Monophenolase and Diphenolase Activities from a Wild Edible Mushroom, Russula Delica”. Asian Journal of Chemistry, vol. 24, no. 3, Dec. 2011, pp. 1203-8, https://asianpubs.org/index.php/ajchem/article/view/8740.