HIRUNPORM, J.; SIRIPRUCHYANUN, M. A Low-voltage Current-mode Electronically Controllable Four-quadrant Zero/span Circuit. ECTI Transactions on Electrical Engineering, Electronics, and Communications, [S. l.], v. 18, n. 1, p. 61–69, 2020. DOI: 10.37936/ecti-eec.2020181.218761. Disponível em: https://ph02.tci-thaijo.org/index.php/ECTI-EEC/article/view/218761. Acesso em: 7 may. 2024.