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Risnawati and Defi and Rio Aldi (2012) THE INFLUENCE OF OPEN ENDED APPROACH WITH COOPERATIVE LEARNING TYPE CO-OP CO-OP TOWARDS PROBLEM SOLVING AND CREATIVE THINKING ABILITY IN MATHEMATIC STUDENTS. In: INTERNATIONAL SEMINAR AND WORKSHOP GRADUATE PROGRAM STATE UNIVERISTY OF PADANG : The Use of Contextualized Tasks to Foster Mathematics Learning, 4 - 5 November 2012, Padang.