1. Schwenk: Surface hardening using the simultaneous dual frequency method, Metallurgia, March 2003, pp. 8–9.
2. Shizumasa Okudaira and Kouki Matsuse: Power control of an adjustable frequency quasi-resonant inverter for dual frequency induction heating, Proceeding of IPMEC-2000, S-34-2, pp. 968–973
3. Shizumasa Okudaira and Kouki Matsuse: Adjustable frequency quasi-resonant inverter circuits having short-circuit switch across resonant capacitor, IEEE Transactions on Power Electronics, Vol.23, No.4, July 2008, pp. 1830–1838.
4. Yusuke Ishimaru, Kazuo Oka, Kazuki Sasou, Kouki Matsuse and Masayoshi Tsukahara: Dual high frequency quasi-resonant inverter circuit by using power MOSFET for induction heating, IPEMC-2009, pp. 2545–2550.
5. Shizumasa Okudaira and Kouki Matsuse: A new quasi-resonant inverter with two-way short-circuit switch across a resonant capacitor, PCC-Osaka 2002, pp. 1496–1501.