Agnieszka Matysiak Szóstek, Berry Eggen. I Know That You Know - Ascertaining Mutual Awareness of Recipient s Availability Status in Instant Messaging Applications. In Tom Gross, Jan Gulliksen, Paula Kotzé, Lars Oestreicher, Philippe A. Palanque, Raquel Oliveira Prates, Marco Winckler, editors, Human-Computer Interaction - INTERACT 2009, 12th IFIP TC 13 International Conference, Uppsala, Sweden, August 24-28, 2009, Proceedings, Part I. Volume 5726 of Lecture Notes in Computer Science, pages 182-195, Springer, 2009. [doi]