Joshua Anhalt Asim Smailagic Daniel P. Siewiorek Francine Gemperle Daniel Salber Sam Weber James E. Beck James Jennings Toward Context-Aware Computing: Experiences and Lessons. 38-46 2001 16 IEEE Intelligent Systems 3 http://csdl2.computer.org/dl/mags/ex/2001/03/x3038.htm db/journals/expert/expert16.html#AnhaltSSGSWBJ01