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• Trutt, F. C.; Kohler, J. L.; Rotithor, H.; Novak, T.
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  Sensitive Ground-Fault Protection for Mines. Phase 3. Coordination-Free GFR's for AC Distribution. Mining Research Contract Report.
  Pennsylvania State Univ., University park
  OFR 2-89
  Bureau of Mines, Washington, DC, OFR 2-89
  June 22, 1988
  97 p.