Spoken versus Written Queries for Mobile Information Access. - Heather Du; Fabio Crestani (Mobile HCI Workshop on Mobile and Ubiquitous Information Access, 2003)

Retrieval Effectiveness of Written and Spoken Queries: An Experimental Evaluation. - Heather Du; Fabio Crestani (FQAS, 2004)

Spoken Versus Written Queries for Mobile Information Access: An Experiment on Mandarin Chinese. - Heather Du; Fabio Crestani (IJCNLP, 2004)

Written versus spoken queries: A qualitative and quantitative comparative analysis. - Fabio Crestani; Heather Du (J. Assoc. Inf. Sci. Technol., 2006)