1. Theory of Ordinary Differential Equations;Coddington,1955
2. Fundamentals of Power Electronics;Erickson,2001
3. Principals of Power Electronics;Kassakian,1991
4. The Fundamentals of Switched-Mode Converters (in Japanese);Harada,1991
5. Frequency-Domain Analysis of Linear Time-Periodic Systems;Sandberg;IEEE Transactions on Automatic Control,2005