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A1 Chahine, Iman. A2 Post, Thomas A2 Del Mas, Robert ID 20228 OP 9 p. T1 The effect of using a research-based curriculum on learning basic rational number concepts by Lebanese students [Article] UL 1 http://search.shamaa.org/fulltext.gif http://www.qscience.com/doi/pdfplus/10.5339/nmejre.2011.3 Full text (PDF)