FREQUENCY LOCKED LOOPS OF THE THIRD AND HIGHER ORDER. REVUE ROUMAINE DES SCIENCES TECHNIQUES — SÉRIE ÉLECTROTECHNIQUE ET ÉNERGÉTIQUE, [S. l.], v. 66, n. 4, p. 261–266, 2022. Disponível em: https://journal.iem.pub.ro/rrst-ee/article/view/47.. Acesso em: 7 may. 2024.