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Zulfah, Zulfah and Astuti, Astuti and Insani, Sri Ulfa and Zulhendri, Zulhendri and Akbar, P (2019) Development of Open-Ended Based Mathematics Problem to Measure High-Level Thinking Ability. International Seminar on Applied Mathematics and Mathematics Education 2019, 1315 (1). pp. 1-9. ISSN IOP Publishing