@article{weko_59772_1,
   author	 = "Katsumi,Tanaka and Masatoshi,Yoshikawa and Kozo,Ishihara",
   title	 = "Schema Design  Views and Incomplete Information in Object-Oriented Databases",
   journal	 = "Journal of Information Processing ",
   year 	 = "1989",
   volume	 = "12",
   number	 = "3",
   pages	 = "239--250",
   month	 = "dec"
}