Agneta Yngve, Alexandra Wolf, Eric Poortvliet, Ibrahim Elmadfa, Johannes Brug, Bettina Ehrenblad, Bela Franchini, Jóhanna Haraldsdóttir, Rikke Krølner, Lea Maes, Carmen Pérez-Rodrigo, Michael Sjöström, Inga Thórsdóttir, Knut-Inge Klepp,
Fruit and Vegetable Intake in a Sample of 11-Year-Old Children in 9 European Countries: The Pro Children Cross-Sectional Survey Annals of Nutrition and Metabolism. ,vol. 49, pp. 236- 245 ,(2005) ,
10.1159/000087247