KURNIAWATI, A.; HAMZAH, T.; INDRATO, T. B. A Low-Cost Transcutaneous Electrical Nerve Stimulation Measuring Device Using Frequency-to-Voltage and Current-to-Voltage . Journal of Electronics, Electromedical Engineering, and Medical Informatics, v. 2, n. 2, p. 65-70, 23 Jul. 2020.