Račkauskienė, Santa, and Darius Šiaučiūnas. “Joint Universality of Some Zeta-Functions. I”. Lietuvos matematikos rinkinys 51, no. proc. LMS (December 21, 2010): 45–50. Accessed April 14, 2025. https://www.journals.vu.lt/LMR/article/view/17771.