Google TV Search: Dual-Wielding Search and Discovery in a Large-Scale Product, Manish Patel, Rich Gossweiler, Mehran Sahami, John Blackburn, David Brown, Andrea Knight, UXTV'08 (2008).
When two methods are better than one: Combining user study with cognitive modeling, Andrea Knight, Guy Pyrzak, Collin Green, CHI '07, 2007, pp. 1783-1788.