Yung-Fa Huang Chin-Wei Hsu Fu-Bin Gao Hsing-Chung Chen Performance of Adaptive Vertical Handoff in Heterogeneous Networks of WLAN and WCDMA Systems. 2103-2107 2009 NCM http://doi.ieeecomputersociety.org/10.1109/NCM.2009.327 conf/ncm/2009 db/conf/ncm/ncm2009.html#HuangHGC09