Victor Chou Hung Avelino J. Gonzalez Ronald F. DeMara Towards a Context-Based Dialog Management Layer for Expert Systems. 60-65 2009 eKNOW http://doi.ieeecomputersociety.org/10.1109/eKNOW.2009.10 conf/eknow/2009 db/conf/eknow/eknow2009.html#HungGD09