Hirunporm, Jirawat, and Montree Siripruchyanun. 2020. “A Low-Voltage Current-Mode Electronically Controllable Four-Quadrant Zero/Span Circuit”. ECTI Transactions on Electrical Engineering, Electronics, and Communications 18 (1):61-69. https://doi.org/10.37936/ecti-eec.2020181.218761.