| Autori | Titlu | Publicatia | An aparitie |
| D.ALEXA | COMBINED FILTERING SYSTEM CONSISTING OF PASSIVE FILTER | IEE PROCEEDINGS ELECTRIC POWER 88-94 | 1999 |
| D.ALEXA, A.LAZAR | OPTIMIZATION OF PWM TEHNIQUES WITH PARTIALLY CONSTANT MODULATING | ELECTRICAL ENGINEERING, 263-271 | 2000 |
| D.ALEXA, A.SIRBU | OPTIMIZED COMBINED HARMONIC FILTERING SYSTEM | IEEE TRANSACTIONS INDUSTRIAL EL,1210-1218 | 2001 |