@article{weko_59634_1,
   author	 = "Kazuki,Yoshida and Akihiko,Ohsuga and Morio,Nagata and Shinichi,Honiden",
   title	 = "Δ-extension of Algebraic Specification",
   journal	 = "Journal of Information Processing ",
   year 	 = "1992",
   volume	 = "15",
   number	 = "2",
   pages	 = "177--186",
   month	 = "oct"
}