An Approach to CFOA-based Second-Order Universal Filters. Elektronika ir Elektrotechnika, [S. l.], v. 31, n. 3, p. 22–29, 2025. DOI: 10.5755/j02.eie.40836. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/40836.. Acesso em: 5 dec. 2025.