Beyond XML Query Languages. - Peter Buneman; Alin Deutsch; Wenfei Fan; Hartmut Liefke; Arnaud Sahuguet; Wang Chiew Tan (QL, 1998)

Specifying Updates in Biomedical Databases. - Hartmut Liefke; Susan B. Davidson (SSDBM, 1999)

Horizontal Query Optimization on Ordered Semistructured Data. - Hartmut Liefke (WebDB (Informal Proceedings), 1999)

View Maintenance for Hierarchical Semistructured Data. - Hartmut Liefke; Susan B. Davidson (DaWaK, 2000)

XMILL: An Efficient Compressor for XML Data. - Hartmut Liefke; Dan Suciu (SIGMOD Conference, 2000)

An Extensible Compressor for XML Data. - Hartmut Liefke; Dan Suciu (SIGMOD Rec., 2000)