Context-based Co-presence detection techniques: A survey. Conti, M. & Lal, C. Comput. Secur., 2020.  
Paper  doi  bibtex   @article{DBLP:journals/compsec/ContiL20,
  author    = {Mauro Conti and
               Chhagan Lal},
  title     = {Context-based Co-presence detection techniques: {A} survey},
  journal   = {Comput. Secur.},
  volume    = {88},
  year      = {2020},
  url       = {https://doi.org/10.1016/j.cose.2019.101652},
  doi       = {10.1016/j.cose.2019.101652},
  timestamp = {Thu, 20 Feb 2020 00:00:00 +0100},
  biburl    = {https://dblp.org/rec/journals/compsec/ContiL20.bib},
  bibsource = {dblp computer science bibliography, https://dblp.org}
} 
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