Novotná, J., Eisenmann, P., Přibyl, J., Ondrušová, J. and Břehovský, J. (2014) “PROBLEM SOLVING IN SCHOOL MATHEMATICS BASED ON HEURISTIC STRATEGIES”, Journal on Efficiency and Responsibility in Education and Science, 7(1), pp. 1–6. doi: 10.7160/eriesj.2014.070101.