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- [22] Participation in the Semantic Web too difficult? SEMANTIC WEB - ISWC 2002, 2002, 2342 : 448 - 453
- [23] WHEN CHILDRENS TEXTBOOKS ARE TOO DIFFICULT ELEMENTARY SCHOOL JOURNAL, 1959, 60 (03): : 146 - 157
- [28] IS CLASSIC POETRY TOO DIFFICULT FOR PRIMARY SCHOOL? 5TH INTERNATIONAL CONFERENCE OF EDUCATION, RESEARCH AND INNOVATION (ICERI 2012), 2012, : 2983 - 2989
- [29] IF ITS TOO DIFFICULT FOR KIDS TO READ - REWRITE IT JOURNAL OF READING, 1977, 21 (03): : 212 - 214
- [30] Complaints of child sexual abuse: Too easy to make or too difficult to prove? AUSTRALIAN AND NEW ZEALAND JOURNAL OF CRIMINOLOGY, 2001, 34 (02): : 149 - 168