SOTNER, R.; JERABEK, J.; PETRZELA, J.; HERENCSAR, N.; PROKOP, R.; VRBA, K. Second-Order Simple Multiphase Oscillator Using Z-Copy Controlled-Gain Voltage Differencing Current Conveyor. Elektronika ir Elektrotechnika, [S. l.], v. 20, n. 9, p. 13-18, 2014. DOI: 10.5755/j01.eee.20.9.8709. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/8709. Acesso em: 4 oct. 2022.