U- and E-Service, Science and Technology - Slezak, Dominik; Ma, Jianhua; Sandnes, Frode Eika ; Gu, Bongen; Fang, Wai-chi; Gu, Bongen; Kang, Byeong-Ho; Kim, Tai-Hoon; Ma, Jianhua; Sandnes, Frode Eika; Slezak, Dominik (Springer Berlin Heidelberg, 2009)