Qtag: introducing the qualitative tagging system. - Sung Eob Lee; Steve SangKi Han (Hypertext, 2007)

Qtag: tagging as a means of rating, opinion-expressing, sharing and visualizing. - Sung Eob Lee; Dong Kwan Son; Steve SangKi Han (SIGDOC, 2007)

Using Qtag to Extract Dominant Public Opinion in Very Large-Scale Conversation. - Sung Eob Lee; Taeksoo Chun; Steve SangKi Han (CSE (4), 2009)