Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) OKAMOTO Toshio and MORIHIRO Koichiro,A Method for Modelling of Student's Understanding-structure by Nonmonotonic Reasoning,Journal of the Japanese Society for Artificial Intelligence,2188-2266,The Japanese Society for Artificial Intelligence,1992-05-01,7,3,496-508,https://cir.nii.ac.jp/crid/1390848647558819072,https://doi.org/10.11517/jjsai.7.3_496