@article{weko_59721_1,
   author	 = "Chin-ChenChang",
   title	 = "A Survey of Key-to-Key User Hierarchic Representation Mechanisms",
   journal	 = "Journal of Information Processing ",
   year 	 = "1991",
   volume	 = "13",
   number	 = "4",
   pages	 = "438--441",
   month	 = "feb"
}