@book{24a242e120b147558274f19d30813a18,
title = "Research and development in the teaching and learning of number systems and arithmetic: Proceedings of Topic Study Group (TSG) 10, ICME-11",
editor = "Bock, {Dirk De} and S{\o}ndergaard, {Bettina Dahl} and {G{\'o}mez Alfonso}, Bernardo and {Chun Chor}, {Litwin Cheng}",
year = "2008",
language = "English",
isbn = "978-90-807827-4-7",
publisher = "<Forlag uden navn>",
note = "ICME, 11th International Congress on Mathematics Education ; Conference date: 06-07-2008 Through 13-07-2008",
}