Task-stage knowledge support: coupling user information needs with stage identification. - I-Chin Wu; Duen-Ren Liu; Wei-Hsiao Chen (IRI, 2005)

Mining and Supporting Task-Stage Knowledge: A Hierarchical Clustering Technique. - Duen-Ren Liu; I-Chin Wu; Wei-Hsiao Chen (PAKM, 2006)

Recommending Quality Book Reviews from Heterogeneous Websites. - Duen-Ren Liu; Wei-Hsiao Chen; Po-Huan Chiu (Internet Res., 2013)