Virtual Stage: a scenario-based karaoke system in a virtual environment. - Kee Chang Lee; ChangWhan Sul; KwangYun Wohn (PG, 1997)

Virtual stage: an interactive 3D karaoke system. - Kee Chang Lee; ChangWhan Sul; SungJoon Hur; KwangYun Wohn (SIGGRAPH Abstracts and Applications, 1998)

Virtual Stage: A Location-Based Karaoke System. - ChangWhan Sul; Kee Chang Lee; KwangYun Wohn (IEEE Multim., 1998)