1. A survey of neutral currents in three-phase computer power systems;Gruzs;IEEE Trans Ind Appl,1990
2. Active filtering of harmonic currents in three-phase, four-wire systems with three-phase and single-phase non-linear loads;Quinn,1992
3. A four-wire, current-controlled converter provides harmonic neutralization in three-phase, four-wire systems;Quinn,1993
4. Performance evaluation of three-phase three and four wire active filters;Thomas,1996
5. A three-phase line-Interactive UPS system implementation with series-parallel active power-line conditioning capabilities;Silva,2001