A Methodology for Building a Patent Test Collection for Prior Art Search. - Erik Graf; Leif Azzopardi (EVIA@NTCIR, 2008)

Automatically Generating Queries for Prior Art Search. - Erik Graf; Leif Azzopardi; Keith van Rijsbergen (CLEF (Working Notes), 2009)

Knowledge Modeling in Prior Art Search. - Erik Graf; Ingo Frommholz; Mounia Lalmas; Keith van Rijsbergen (IRFC, 2010)

Human information processing based information retrieval. - Erik Graf (2011)