Demirtas, M. ., M. A. Erismis, and S. Gunes. “A Lossy Capacitance Measurement Circuit Based on Analog Lock-in Detection”. Elektronika Ir Elektrotechnika, vol. 26, no. 5, Oct. 2020, pp. 4-10, doi:10.5755/j01.eie.26.5.25809.