Sengpyo Hong Jong-gil Ahn Heedong Ko Jinwook Kim Acquiring a Physical World and Serving Its Mirror World Simultaneously. 445-453 2009 HCI (13) http://dx.doi.org/10.1007/978-3-642-02771-0_50 conf/hci/2009-13 db/conf/hci/hci2009-13.html#HongAKK09