@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}
}
