VARBANETS, S. P. General Kloosterman sums over ring of Gaussian integers. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 9, p. 1179–1200, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3381. Acesso em: 6 dec. 2025.