Iasonas Polakis, Stamatis Volanis, Elias Athanasopoulos, Evangelos P. Markatos. was there: validating check-ins in location-based services. In Charles N. Payne Jr., editor, Annual Computer Security Applications Conference, ACSAC '13, New Orleans, LA, USA, December 9-13, 2013. pages 19-28, ACM, 2013. [doi]
Abstract is missing.