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GULTOM, BETA NOVITA and Lubis, Ashar Muda and Han, Peng (2020) STUDY ON IONOSPHERIC DISTURBANCE BASED ON TOTAL ELECTRON CONTENT (TEC) ASSOCIATED WITH THE 2009 WEST SUMATRA EARTHQUAKE (Mw 7.6) FROM GNSS. Undergraduated thesis, Fakultas Matematika dan Ilmu Pengetahuan Alam.