V. Garbaliauskienė, J. Karaliūnaitė, and A. Laurinčikas, “On Zeros of Some Combinations of Dirichlet L-Functions and Hurwitz Zeta-Functions”, MMA, vol. 22, no. 6, pp. 733–749, Nov. 2017, doi: 10.3846/13926292.2017.1365313.