@article{weko_16698_1, author = "Keiichirou,Kusakari and Masahiko,Sakai and Toshiki,Sakabe", title = "Characterizing Inductive Theorems by Extensional Initial Models in a Higher - Order Equational Logic", journal = "情報処理学会論文誌プログラミング(PRO)", year = "2004", volume = "45", number = "SIG05(PRO21)", pages = "87--87", month = "may" }