@conference{f4921fcd5c7f426f921535d30811b953,
title = "Early development of number sense",
author = "V. Akerboom and E.H. Kroesbergen and M.J.M Volman",
note = "BJEP Current Trends Conference ' Understanding number development and difficulties', Institute of Education University of London; BJEP Current Trends Conference ' Understanding number development and difficulties', Institute of Education University of London ; Conference date: 29-05-2008 Through 30-05-2008",
year = "2008",
month = may,
day = "29",
language = "Undefined/Unknown",
}