Martin Graff
发表
Evaluating a web based intelligent tutoring system for mathematics at German lower secondary schools
Peter Mayer,
Martin Graff,
Morena Lebens,
2008,
Education and Information Technologies.
Martin Graff,
M. Graff,
2003,
Br. J. Educ. Technol..
Jo Davies,
Martin Graff,
M. Graff,
2005,
Br. J. Educ. Technol..