Csányi, P.; Fábián, K.; Szabó, C.; Szabó, Z.; Vásárhelyi, Éva. Number Theory Vs. Hungarian Highschool Textbooks: √2 Is Irrational. Teach. Math. Comp. Sci. 2016, 14 (2), 139-152. https://doi.org/10.5485/TMCS.2016.0416.