@techreport{warnings:tr12,
  author =       {Lujo Bauer and Cristian Bravo-Lillo and Lorrie Cranor and Elli Fragkaki},
  title =        {Warning Design Guidelines},
  institution =  {CyLab, Carnegie Mellon University},
  year =         {2013},
  number =       {CMU-CyLab-13-002},
  month =        feb,
  url =          {http://www.cylab.cmu.edu/research/techreports/2013/tr_cylab13002.html},
}