Balčiūnas, A., Garbaliauskienė, V., Karaliūnaitė, J., Macaitienė, R., Petuškinaitė, J. and Rimkevičienė, A. (2020) “Joint discrete approximation of a pair of analytic functions by periodic zeta-functions”, Mathematical Modelling and Analysis, 25(1), pp. 71-87. doi: 10.3846/mma.2020.10450.