db/conf/cikm/Shum93.html Chung-Dak Shum Quick and Incomplete Responses: The Semantic Approach. 39-48 CIKM1993/P039.pdf 1993 conf/cikm/93 CIKM db/conf/cikm/cikm93.html#Shum93 http://doi.acm.org/10.1145/170088.170100