LAURINČIKAS, A.; ŠIAUČIŪNAS, D. On Zeros of Periodic Zeta Functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 6, p. 857–862, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2471. Acesso em: 5 dec. 2025.