@article {pierrakeas2009assisting,
	title = {Assisting tutors at the Hellenic Open University in the processes of designing, planning, managing and reusing learning activities},
	journal = {Proceedings of the 2009 European LAMS \& Learning Design Conference},
	year = {2009},
	author = {Christos J. Pierrakeas and Papadakis, Spyros and Xenos, Michalis}
}
@article {kalles2008intelligently,
	title = {Intelligently Raising Academic Performance Alerts},
	journal = {1st International Workshop on Combinations of Intelligent Methods and Applications (CIMA), 18th European Conference on Artificial Intelligence, Patras, Greece},
	year = {2008},
	pages = {37{\textendash}42},
	author = {Kalles, Dimitris and Christos J. Pierrakeas and Xenos, Michalis}
}
@article {stamatiou2007cryptographically,
	title = {Cryptographically secured communication between tutors of the Computer Science course of the Hellenic Open University: Experiences from the introductory module {\textquoteleft}Introduction to Computer Science{\textquoteright}(in Greek)},
	journal = {HELLENIC OPEN UNIVERSITY JOURNAL OF INFORMATICS},
	volume = {1},
	number = {1},
	year = {2007},
	author = {Stamatiou, Yiannis and Christos J. Pierrakeas and Xenos, Michalis}
}
@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}
}
@article {xenos2004assessing,
	title = {Assessing the quality of web sites used in higher open distance education courses},
	journal = {Education, Communication \& Information},
	volume = {4},
	number = {2-3},
	year = {2004},
	pages = {237{\textendash}253},
	publisher = {Taylor \& Francis},
	author = {Xenos, Michalis and Dermitzioti, Evgenia and Christos J. Pierrakeas}
}
@article {pierrakeas2003evaluating,
	title = {Evaluating and improving educational material and tutoring aspects of distance learning systems},
	journal = {Studies in Educational Evaluation},
	volume = {29},
	number = {4},
	year = {2003},
	pages = {335{\textendash}349},
	publisher = {Pergamon},
	author = {Christos J. Pierrakeas and Xenos, Michalis and Pintelas, Panayiotis}
}
@article {xenos2002survey,
	title = {A survey on student dropout rates and dropout causes concerning the students in the Course of Informatics of the Hellenic Open University},
	journal = {Computers \& Education},
	volume = {39},
	number = {4},
	year = {2002},
	pages = {361{\textendash}377},
	publisher = {Elsevier},
	author = {Xenos, Michalis and Christos J. Pierrakeas and Pintelas, Panagiotis}
}
