Ronald Baecker Steve R. Harrison William Buxton Steven E. Poltrock Elizabeth F. Churchill Media spaces: past visions, current realities, future promise. 2245-2248 2008 CHI Extended Abstracts http://doi.acm.org/10.1145/1358628.1358660 conf/chi/2008a db/conf/chi/chi2008a.html#BaeckerHBPC08