Kyong Joon Lee Sang Chul Ahn Hyoung-Gon Kim Using a mobile device as an interface tool for HMD-based AR applications. 7 2006 conf/ACMace/2006 Advances in Computer Entertainment Technology http://doi.acm.org/10.1145/1178823.1178833 db/conf/ACMace/ace2006.html#LeeAK06