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2019 · Murniaty Simorangkir, Bajoka Nainggolan, et al. · Proceedings of the Proceedings of The 5th Annual International Seminar on Trends in Science and Science Education, AISTSSE 2018, 18-19 October 2018, Medan, Indonesia · 12
2018 · Herbert C.B. Manalu, Saronom Silaban, et al. · Annual International Seminar on Transformative Education and Educational Leadership (AISTEEL) · 12
2019 · Freddy Panggabean, Saronom Silaban, et al. · Proceedings of the Proceedings of The 5th Annual International Seminar on Trends in Science and Science Education, AISTSSE 2018, 18-19 October 2018, Medan, Indonesia · 8