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Arnelis, Arnelis and Asmar, Ali and Permana, Dony and Jamaan, Elita Zusti and Amalita, Nonong (2019) Improving Mathematical Teachers Competency 21th Through Workshop Development of Mathematical Olympic Problems Based on High Order Thinking Skills in SMP Solok Selatan District. Pelita Eksakta, 2 (2). pp. 109-114. ISSN 2615-0719