@article{weko_174597_1,
   author	 = "Tim,Felgentreff and Robert,Hirschfeld and Maria,Graber and Alan,Borning and Hidehiko,Masuhara",
   title	 = "Declaring Constraints on Object-oriented Collections",
   journal	 = "情報処理学会論文誌プログラミング（PRO）",
   year 	 = "2016",
   volume	 = "9",
   number	 = "4",
   month	 = "sep"
}