VOROBYOV, Maxim; VITOLS, Kristaps. Low-Cost Voltage Zero-Crossing Detector for AC-Grid Applications. Electrical, Control and Communication Engineering, Riga, Latvia, v. 6, n. 1, p. 32–37, 2014. DOI: 10.2478/ecce-2014-0015. Disponível em: https://ecce-journals.rtu.lv/ecce/article/view/ecce-2014-0015.. Acesso em: 8 may. 2024.