"Infants." . . "conservation (psychologie) enfant." . . "Conservation (Psychologie)" . . "Conservation (Psychology)" . . . . "Number concept in children." . . "enfant nombre - concept." . . "børnepsykologi" . . "Entwicklung." . . . . . . "Children from five to / 7" . "Children from five to : Some aspects of the number concept; Forew. by J. de Wit / 7" . . . . . . . "Children from five to seven : some aspects of the number concept" . . . . . "Children from 5 to 7 : Some aspects of the number concept" . "Children from 5 to 7 : some aspects of the number concept. Forewordby J. de wit" . . "Zahlvorstellung"@en . "Zahlvorstellung" . . . . . . . "Children from five to seven" . . . "Children from 5 to 7 : some aspects of the number concept" . . "Children from 5 to 7. Some aspects of the number concept" . "Children from 5 to 7. Some aspects of the number concept"@en . . . . . . . . . . . . "Children from 5 to 7" . . . . . . . . . "Kind." . . "talbegreb" . . "Enfants Psychologie." . . "Enfants - Psychologie." . "Concept de nombre." . . "Psicologia infantil." . . "Getallebegrip." . .