@techreport{weko_20556_1,
   author	 = "坂間,千秋",
   title	 = "Well - Founded Epistemic Theory of Knowledge Bases",
   year 	 = "1990",
   institution	 = "京都高度技術研究所",
   number	 = "88(1990-DBS-080)",
   month	 = "nov"
}