@techreport{weko_38907_1,
   author	 = "久保,幸夫",
   title	 = "地理情報システムの動向",
   year 	 = "1991",
   institution	 = "慶応義塾大学環境情報学部",
   number	 = "70(1991-CG-051)",
   month	 = "jul"
}