@Incollection{calemis2010astra,
  author = {Calemis, Ioannis and Kameas, Achilles and Goumopoulos, Christos and Berg, Erik},
  title  = {ASTRA: An Awareness Connectivity Platform for Designing Pervasive Awareness Applications},

  year   = {2010},
  number = {},
  url    = {http://dx.doi.org/10.1007/978-90-481-3658-2_32},
  doi = {10.1007/978-90-481-3658-2_32},
  const  = {\ text}
}