Umar, Lazuardi, Yanuar Hamzah, and Rahmondia N Setiadi. 2019. “MULTI-CHANNEL FRY COUNTER DESIGN USING OPTOCOUPLER SENSOR”. Spektra: Jurnal Fisika Dan Aplikasinya 4 (2):97-104. https://doi.org/10.21009/SPEKTRA.042.06.