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		Lukito, P., 		Supardi, I., & 		Ratini, N.
(2023).
 Design of a Heartbeat Detector Using a Photopletysmograph Method Based on an ATMega328 Microcontroller.
<em>BULETIN FISIKA, 24</em>(2), 135 – 141.
doi:10.24843/BF.2023.V24.i02.p10