Pranam Kolari Timothy W. Finin Yelena Yesha Kelly A. Lyons Jen Hawkins Stephen G. Perelgut 231-234 2006 conf/policy/2006 POLICY http://doi.ieeecomputersociety.org/10.1109/POLICY.2006.23 db/conf/policy/policy2006.html#KolariFYLHP06