1. (1) Energy policy act of 1992 (EPAct) ; USA (1992)
2. (2) K. Ohyama: “Recent Advances of Reluctance Torque Assisted Motors”, T. IEE Japan, Vol. 123-D, No. 2, pp. 63-66 (2003) (in Japanese)
3. (3) H. Kudo: “Energy Conservation Technology Innovation by Electric Engineering”, T. IEE Japan, Vol. 126, No. 1, pp. 28-31 (2006) (in Japanese)