Djafar, Zuryati, et al. “Correlation of Sunlight Intensity and Output Voltage on Collector Plate-Based Cascaded Thermoelectric Generator Modules”. Protek : Jurnal Ilmiah Teknik Elektro, vol. 10, no. 3, Sept. 2023, pp. 179-83, doi:10.33387/protk.v10i3.6375.