Visible Past: Learning and discovering in real and virtual space and time. - Sorin Adam Matei; Chris C. Miller; Laura L. Arns; Nick Rauh; Chris Hartman; Robert Bruno (First Monday, 2007)

Information Acquisition and Recall in Location-Aware and Search Engine Retrieval Systems. - Sorin Adam Matei; Lance Madsen; Robert Bruno (Int. J. Inf. Technol. Web Eng., 2010)