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ITS '98 : intelligent tutoring systems (San Antonio TX, 16-19 August 1998)Goettl, Barry P; Halff, Henry M; Redfield, Carol L et al.Lecture notes in computer science. 1998, issn 0302-9743, isbn 3-540-64770-8, XIX, 629 p, isbn 3-540-64770-8Conference Proceedings