Ken Barker Vinay K. Chaudhri Shaw Yi Chaw Peter Clark Daniel Hansch Bonnie E. John Sunil Mishra John Pacheco Bruce W. Porter Aaron Spaulding Moritz Weiten AURA: Enabling Subject Matter Experts to Construct Declarative Knowledge Bases from Science Textbooks. 1960-1961 2007 conf/aaai/2007 AAAI db/conf/aaai/aaai2007.html#BarkerCCCHJMPPSW07