@techreport{weko_20751_1,
   author	 = "中野,良平 and 斉藤,和巳",
   title	 = "集約関数まで拡張した関係論理／関係代数変換法",
   year 	 = "1987",
   institution	 = "NTT電気通信研究所, NTT電気通信研究所",
   number	 = "4(1986-DBS-057)",
   month	 = "jan"
}