Gillian R. Hayes Erika Shehan Poole Giovanni Iachello Shwetak N. Patel Andrea Grimes Gregory D. Abowd Khai N. Truong Physical, Social, and Experiential Knowledge in Pervasive Computing Environments. 56-63 2007 6 IEEE Pervasive Computing 4 http://doi.ieeecomputersociety.org/10.1109/MPRV.2007.82 db/journals/pervasive/pervasive6.html#HayesPIPGAT07