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		Diah Parwati, N., 		Wiharta, D., & 		Setiawan, W.
(2018).
 RANCANG BANGUN SISTEM PERINGATAN DINI BAHAYA TANAH LONGSOR DENGAN SENSOR HYGROMETER DAN PIEZOELECTRIC.
<em>Jurnal SPEKTRUM, 5</em>(2), 183-190.
doi:10.24843/SPEKTRUM.2018.v05.i02.p23