1. Lyapunov redesign of analog phase-lock loops;Abramovitch;Communications, IEEE Transactions on,1990
2. Lyapunov redesign of classical digital phase-lock loops. In American Control Conference, 2003. Proceedings of the 2003, volume 3, 2401– 2406;Abramovitch,2003
3. Abramovitch, D. (2004). Method for guaranteeing stable non-linear PLLs. US Patent App. 10/414,791, http://www.google.com/patents/US20040208274.
4. Stability and dynamical properties of astatic frequency synchronization system;Bakaev;Ra-diotekhnika i Elektronika,1963
5. Bakaev, Y. and Guzh, A. (1976). Optimal reception of fm signal in a doppler effect. Radiomekhanika i Elektronika, 10(1).