1. Investigation of a New Control Strategy for Electronic Ballasts Based on Variable Inductor
2. Everett , S-S . 1994.Fluorescent lamp ballast dimming control circuit. US Patent 5,539,284, 29 September
3. Fields , G-S . 1998.Triac dimmable, single stage compact fluorescent lamp. US Patent 5,994,848, 4 March
4. Gradzki , P-M and Janczak , J . 1997a.Dimmable compact fluorescent lamp. US Patent 6,043,611, 10 April