LANGHAMMER, L.; DVORAK, J.; SOTNER, R.; JERABEK, J. Electronically Tunable Fully-Differential Fractional-Order Low-Pass Filter. Elektronika ir Elektrotechnika, [S. l.], v. 23, n. 3, p. 47-54, 2017. DOI: 10.5755/j01.eie.23.3.18332. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/18332. Acesso em: 25 sep. 2022.