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Widiyanto, Retno and Herlina, Kartini and Andra, Doni (2021) The need analysis of using physic e-module based PjBL– integrated STEM: The preliminary study research as a solution to improve problem-solving skills on light refraction material. Journal of Physics: Conference Series, 1796 (012079). 012079-1-012079-6. ISSN Print : 1742-6588 Online : 1742-6596