Validation of a food quantification picture book targeting children 0-10 years of age for pan-european and national dietary surveys, Trolle, E., Vandevijvere Stefanie, Ruprich J., Ege M., Dofkova M., and de Boer E. , British Journal of Nutrition, 1/7/2013, Volume 110, Issue 12, Number 2308, p.2298 - 2308, (2013)