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 October 26, 2026. https://zurnalai.vu.lt/LMR/article/view/17771.