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cinqui\u00e8me rencontre annuelle / PME-NA, North American Chapter of the International Group for the Psychology of Mathematics Education, page 272-279","label":"Main title"},{"value":"On children's quantitative concept of rational number: construct and estimate the sum","label":"Title"},{"value":"Behr, Merlyn J.","label":"Author"},{"value":"Wachsmuth, Ipke","label":"Author"},{"value":"Post, Thomas R.","label":"Author"},{"value":"Bergeron, Jacques C.","label":"Editor"},{"value":"Herscovic, Nicolas","label":"Editor"},{"value":"1983","label":"Published"},{"value":"English","label":"Language"},{"value":"Conference Proceedings","label":"Document type"},{"value":"urn:nbn:de:0070-bipr-25422","label":"URN"}]}