Analysis of Learning Obstacles for Junior High School Students in Understanding SPLDV Concepts by Firda Luthfiatika Jannah, Neneng Aminah, Surya Amami Pramuditya, Cita Dwi Rosita, M. Subali Noto

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Epistemological learning obstacles on fractions in elementary school by Een Unaenah, Didi Suryadi, Turmudi Turmudi

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Learning obstacles in solving story problems on probability for vocational high school students by Nenden Suciyati Sartika, Siti Mega Mustika, Asep Sahrudin, Ika Meika, Ratu Mauladaniyati, Ika Yunitasari

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De L’Histoire véritable au boulet de Jules Verne : une histoire science-fictionnelle des paradigmes astronomiques by Estelle Blanquet, Éric Picholle

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Abstraction level of van Hiele’s theory: Occurrence of side effects in GeoGebra integration by Thesa Kandaga, Idha Novianti, Mazlini Adnan

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