Semadeni, Z. “Reforms of Curricula and School Textbooks Inspired by the so-Called New Math Half a Century ago”. Annales Universitatis Paedagogicae Cracoviensis | Studia Ad Didacticam Mathematicae Pertinentia, vol. 12, Dec. 2020, pp. 211-48, doi:10.24917/20809751.12.10.