On Types for XML Query Language Xcerpt. - Artur Wilk; Wlodzimierz Drabent (PPSWR, 2003)

Descriptive Typing Rules for Xcerpt. - Sacha Berger; Emmanuel Coquery; Wlodzimierz Drabent; Artur Wilk (PPSWR, 2005)

XML Querying Using Ontological Information. - Hans Eric Svensson; Artur Wilk (PPSWR, 2006)

A Prototype of a Descriptive Type System for Xcerpt. - Artur Wilk; Wlodzimierz Drabent (PPSWR, 2006)

Extending XML Query Language Xcerpt by Ontology Queries. - Wlodzimierz Drabent; Artur Wilk (Web Intelligence, 2007)

Types for XML with Application to Xcerpt. - Artur Wilk (2008)