@article{Borroy:169224,
      author        = "Borroy, J. and Borroy, S. and Martínez, E. and El Halabi,
                       N. and Martín, S. and García-Gracia, M.",
      title         = "{Directional undervoltage pilot scheme for distribution
                       generation networks protection}",
      year          = "2012",
}