GELEŽEVIČIUS, V. The Multipurpose Two-Dimensional Servo Systems and Their Applications. Elektronika ir Elektrotechnika, [S. l.], v. 28, n. 5, 2000. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/18277. Acesso em: 7 oct. 2022.