Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) KASAI Toshinobu and YAMAGUCHI Haruhisa and NAGANO Kazuo and MIZOGUCHI Riichiro,A Support for Searching Lesson Plans Which Aim at Enhancement of Problem-Solving Ability by Using Metadata Described based on Ontologies( Application and Aggregation of Learning Objects and Learning Data),Japan Journal of Educational Technology,13498290,Japan Society for Educational Technology,2007,31,3,337-348,https://cir.nii.ac.jp/crid/1390282680201182720,https://doi.org/10.15077/jjet.kj00004964298