Prasad Calyam Mark Haffner Eylem Ekici Chang-Gun Lee Measuring Interaction QoE in Internet Videoconferencing. 14-25 2007 conf/mmns/2007 MMNS http://dx.doi.org/10.1007/978-3-540-75869-3_2 db/conf/mmns/mmns2007.html#CalyamHEL07