Macaitienė, R. “Joint Universality for $L$-Functions from Selberg Class and Periodic Hurwitz zeta-Functions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 70, no. 5, May 2018, pp. 655-71, https://umj.imath.kiev.ua/index.php/umj/article/view/1585.