Antti Salovaara, Antti Lindqvist, Tero Hasu, Jonna Häkkilä. The phone rings but the user doesn't answer: unavailability in mobile communication. In Markus Bylund, Oskar Juhlin, Ylva Fernaeus, editors, Proceedings of the 13th Conference on Human-Computer Interaction with Mobile Devices and Services, Mobile HCI 2011, Stockholm, Sweden, August 30 - September 2, 2011. pages 503-512, ACM, 2011. [doi]
Abstract is missing.