@inbook {hadzilacos2008developing,
	title = {On Developing and Communicating User Models for Distance Learning Based on Assignment and Exam Data},
	booktitle = {Intelligent Interactive Systems in Knowledge-Based Environments},
	year = {2008},
	pages = {137{\textendash}155},
	publisher = {Springer},
	organization = {Springer},
	author = {Hadzilacos, Thanasis and Kalles, Dimitris and Christos J. Pierrakeas}
}
@inbook {hadzilacos2006small,
	title = {On small data sets revealing big differences},
	booktitle = {Advances in Artificial Intelligence},
	year = {2006},
	pages = {512{\textendash}515},
	publisher = {Springer},
	organization = {Springer},
	author = {Hadzilacos, Thanasis and Kalles, Dimitris and Christos J. Pierrakeas and Xenos, Michalis}
}
