Conceptual framework and models for identifying and organizing usability impact factors of mobile phones. - Dong-Han Ham; Jeongyun Heo; Peter Fossick; B. L. William Wong; Sanghyun Park; Chiwon Song; Mike D. Bradley (OZCHI, 2006)

Model-Based Approaches to Quantifying the Usability of Mobile Phones. - Dong-Han Ham; Jeongyun Heo; Peter Fossick; B. L. William Wong; Sanghyun Park; Chiwon Song; Mike D. Bradley (HCI (2), 2007)