@Inproceedings{singer2015hyptrails,
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  year   = {2015},
  number = {},
  url    = {http://www.www2015.it/documents/proceedings/proceedings/p1003.pdf},

  const  = {\ text}
}
@Article{Panisson2011,
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  year   = {2011},
  number = {},
  url    = {http://www.sciencedirect.com/science/article/pii/S1570870511001272},
  doi = {10.1016/j.adhoc.2011.06.003},
  const  = {\ text}
}
@Article{Kulkarni:2009:Biomed-Eng-Online:19656402,
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  number = {},
  url    = {http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2731770/},
  doi = {10.1186/1475-925X-8-16},
  const  = {\ text}
}