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- [5] UNDERSTANDING UNINTERRUPTIBLE POWER-SUPPLIES .8. SPECIFYING UPS SYSTEMS EC&M-ELECTRICAL CONSTRUCTION AND MAINTENANCE, 1984, 83 (04): : 78 - 81
- [6] UNDERSTANDING UNINTERRUPTIBLE POWER-SUPPLIES .9. SPECIFYING UPS SYSTEMS EC&M-ELECTRICAL CONSTRUCTION AND MAINTENANCE, 1984, 83 (06): : 86 - 88