Leonov, G. A.; Kuznetsov, N. V.; Yuldashev, M. V.; Yuldashev, R. V. (2015). "Hold-in, pull-in, and lock-in ranges of PLL circuits: rigorous mathematical definitions and limitations of classical theory". IEEE Transactions on Circuits and Systems I: Regular Papers. 62 (10). IEEE: 2454–2464. arXiv:1505.04262. doi:10.1109/TCSI.2015.2476295. S2CID12292968.
Leonov, G. A.; Kuznetsov, N. V.; Yuldashev, M. V.; Yuldashev, R. V. (2015). "Hold-in, pull-in, and lock-in ranges of PLL circuits: rigorous mathematical definitions and limitations of classical theory". IEEE Transactions on Circuits and Systems I: Regular Papers. 62 (10). IEEE: 2454–2464. arXiv:1505.04262. doi:10.1109/TCSI.2015.2476295. S2CID12292968.
Leonov, G. A.; Kuznetsov, N. V.; Yuldashev, M. V.; Yuldashev, R. V. (2015). "Hold-in, pull-in, and lock-in ranges of PLL circuits: rigorous mathematical definitions and limitations of classical theory". IEEE Transactions on Circuits and Systems I: Regular Papers. 62 (10). IEEE: 2454–2464. arXiv:1505.04262. doi:10.1109/TCSI.2015.2476295. S2CID12292968.