@techreport{weko_59547_1,
   author	 = "加藤文夫 and 斎藤正男",
   title	 = "階層型データ・ベース",
   year 	 = "1976",
   institution	 = "東京大学, 東京大学",
   number	 = "40(1975-MED-009)",
   month	 = "mar"
}