Representation for program control structures by rewriting of flow graphs. - Norihide Hattori; Naohiro Ishii (Inf. Softw. Technol., 1995)

A method to remove variations in source codes. - Norihide Hattori; Naohiro Ishii (Inf. Softw. Technol., 1996)

An extended educational system for programming and its evaluation. - Norihide Hattori; Naohiro Ishii (Inf. Softw. Technol., 1999)