Jaroslav Janáček, Michal Koháni, Dobroslav Grygar and René Fabricius 2021. Two Objective Public Service System Design Problem. Communications - Scientific letters of the University of Zilina. 23, 4 (Oct. 2021), E68-E75. DOI:https://doi.org/10.26552/com.C.2021.4.E68-E75.