Current issues of research on nationality policy and nationality relations in Slovakia in the 20th and the 21st centuries : the proceedings of the International scientific conference of the scientific project APVV-15-0745 : trends in the development of ethnic realations in Slovakia (Comparative research on nationality issue between 2004 and 2020) - (TEES) - Šutaj, Štefan, 1954-; Heldáková, Lucia; Regináčová, Nikola (Universum-EU, s.r.o., 2017)