CHAR-DIR CHUNGC.-D. ChungW.-C. ChenCHAR-DIR CHUNG2018-09-102018-09-102012-01http://scholars.lib.ntu.edu.tw/handle/123456789/374163journal article10.1109/TCOMM.2011.082911.1002982-s2.0-84863136644WOS:000300425700008