Maass, Hans. “Die Bestimmung Der Dirichletreihen Mit Grossencharakteren Zu Den Modulformen N-Ten Grades”. The Journal of the Indian Mathematical Society 19, no. 1 (March 1, 1955): 1–23. Accessed May 8, 2024. https://www.informaticsjournals.com/index.php/jims/article/view/17001.