Mongnam Han Youngseok Lee Sue B. Moon Keon Jang Dooyoung Lee Evaluation of VoIP Quality over WiBro. 51-60 2008 PAM http://dx.doi.org/10.1007/978-3-540-79232-1_6 conf/pam/2008 db/conf/pam/pam2008.html#HanLMJL08