Zhuo Chen Lingyun Wang Feng Zhang Xinbing Wang Wen Chen VoIP over WLANs by Adapting Transmitting Interval and Call Admission Control. 3242-3246 2008 ICC http://dx.doi.org/10.1109/ICC.2008.610 conf/icc/2008 db/conf/icc/icc2008.html#ChenWZWC08