LIU, Zixiao. Design of ECG Signals Filter Circuit Based on OTA Filtering. Highlights in Science, Engineering and Technology, [S. l.], v. 32, p. 135–142, 2023. DOI: 10.54097/hset.v32i.4983. Disponível em: https://drpress.org/ojs/index.php/HSET/article/view/4983. Acesso em: 16 may. 2026.