D. A. Setiawati, G. M. D. Putra, and W. K. Sugandi, “UJI KINERJA SISTEM PEMANTAUAN VOLUME BIOGAS BERBASIS MIKROKONTROLER ARDUINO PADA BIODIGESTER TIPE FLOATING DRUM [Test Performance of Monitoring System Based on Arduino Microcontroller in Floating Drum Type Biodigester ]”, JRPB, vol. 5, no. 2, pp. 429–439, Sep. 2017.