Defining Interactivity: A Qualitative Identification of Key Dimensions. - Edward J. Downes; Sally J. McMillan (New Media Soc., 2000)

Cell phone usage: an analysis of users' subjective responses in the adoption. - Kumiko Aoki; Edward J. Downes (ISTAS, 2002)

An analysis of young people's use of and attitudes toward cell phones. - Kumiko Aoki; Edward J. Downes (Telematics Informatics, 2003)