TY  - DATA
AU  - Barry P. Goettl, Henry M. Halff, Carol L. Redfield, Valerie J. Shute
TI  - Intelligent Tutoring Systems
SN  - 9783540687160
PY  - 1998///
PB  - Springer Berlin Heidelberg
KW  - Computer Science
UR  - https://doi.org/10.1007/3-540-68716-5
ER  -