Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Kuwabara Tsuneo,Relationship between complexity of information and difficulty of example‐oriented textbooks,Systems and Computers in Japan,0882-1666,Wiley,1998-07-01,29,,9-18,https://cir.nii.ac.jp/crid/1872835442860799744,https://doi.org/10.1002/(sici)1520-684x(199807)29:8<9::aid-scj2>3.3.co;2-g