[[1] Gabriela Kiryakova, Nadezhda Angelova, Lina Yordanova, “GAMIFICATION IN EDUCATION “.]Search in Google Scholar
[[2] K. Arrow, „The Principle of Rationality in Collective Decisions” (1952), apud A. Sen (2002: p. 328)]Search in Google Scholar
[[3] Aidan Lyon, Eric Pacui, „The Wisdom of Crowds: Methods of Human Judgement Aggregation”, University of Maryland, College Park.]Search in Google Scholar
