CERME 11 Eleventh Congress of the European Society for Research in Mathematics Education Eleventh Congress of the European Society for Research in Mathematics Education, Utrecht University, Feb 2019, Utrecht, Netherlands www.cerme11.org
CERME 9-Ninth Congress of the European Society for Research in Mathematics Education CERME 9-Ninth Congress of the European Society for Research in Mathematics Education, Charles University in Prague, Faculty of Education; ERME, Feb 2015, Prague, Czech Republic. pp.2283-2284