@inproceedings{LCT-2015-Iitaka,
	author        = "Toshikazu Iitaka",
	booktitle     = "{Proceedings of the Second International Conference on Learning and Collaboration Technologies.}",
	doi           = "10.1007/978-3-319-20609-7_23",
	isbn          = "978-3-319-20608-0",
	pages         = "238--248",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Recommendation Engine for an Online Drill System}",
	volume        = 9192,
	year          = 2015,
}