Shih-jui LinJane Yung-jen Hsu2010-10-282018-07-052010-10-282018-07-052004http://ntur.lib.ntu.edu.tw//handle/246246/219599en-USHierarchical Concept Learning for Personal Calendar Agentsconference paperhttp://ntur.lib.ntu.edu.tw/bitstream/246246/219599/1/31.pdf