Rhin, Georges, and Carlo Viola. “The Permutation Group Method for the Dilogarithm”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 4, no. 3 (December 4, 2009): 389-437. Accessed June 19, 2025. http://20.103.181.36/index.php/annaliscienze/article/view/73.