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Indrasari, Widyaningrum and Fahdiran, Riser and Budi, Esmar and Jannah, Luluil and Kadarwati, Lutvitria and Ramli, Ramli (2018) Active Solar Tracker Based on The Horizon Coordinate System. In: The 8th International Conference on Theoretical and Applied Physics, 20–21 September 2018, Medan, Indonesia.