1. Chaos and nonlinear dynamics;Hilborn,2000
2. Nonlinear oscillations;Nayfeh,1979
3. Nonlinear dynamics and chaos;Strogatz,2007
4. A study of injection locking and pulling in oscillators;Rajavi;IEEE J Solid State Circ,2004
5. Synchronization: a universal concept in nonlinear sciences;Pikovsky,2001