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		Dwijaputra, I., 		Satriya Wibawa, I., & 		Wendri, N.
(2018).
 Designing CCTV Working Optimization System as Room Security Using Passive Infrared (PIR) Sensor Based on AT89S52 Microcontroller.
<em>BULETIN FISIKA, 19</em>(2), 46-51.
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