@article {solomou2015characterization,
	title = {Characterization of Educational Resources in e-Learning Systems Using an Educational Metadata Profile},
	journal = {Journal of Educational Technology \& Society},
	volume = {18},
	number = {4},
	year = {2015},
	pages = {246{\textendash}260},
	publisher = {International Forum of Educational Technology \& Society},
	author = {Solomou, Georgia and Christos J. Pierrakeas and Kameas, Achilles}
}
@proceedings {spyropouloudesign,
	title = {DESIGN AND DEVELOPMENT OF A WEB-BASED TOOL FOR SUPPORTING EDUCATORS DURING AN INSTRUCTIONAL DESIGN PROCESS BASED ON LEARNING OBJECTS},
	journal = {7th Αnnual International Conference on Education and New Learning Technologies},
	year = {2015},
	author = {Spyropoulou, Natalia and Christos J. Pierrakeas and Kameas, Achilles}
}
@article {spyropoulou2015developing,
	title = {Developing a Computer Programming MOOC},
	journal = {Procedia Computer Science},
	volume = {65},
	year = {2015},
	pages = {182{\textendash}191},
	publisher = {Elsevier},
	author = {Spyropoulou, Natalia and Demopoulou, Gerasimoula and Christos J. Pierrakeas and Koutsonikos, Ioannis and Kameas, Achilles}
}
@proceedings {panopoulouexploiting,
	title = {Exploiting Concept Map Mining Process for e- Content Development},
	journal = {7th annual International Conference on Education and New Learning Technologies},
	year = {2015},
	author = {Panopoulou, Chara and Spyropoulou, Natalia and Christos J. Pierrakeas and Kameas, Achilles}
}
@proceedings {panopoulouextented,
	title = {THE EXTENTED CORRELLATION VERB ONTOLOGY: A NEW APPROACH FOR OBJECT PROPERTIES SPECIFICATION WITHIN DOMAIN KNOWLEDGE REPRESENTATION},
	journal = {11th International Conference Applied Computing},
	year = {2015},
	author = {Panopoulou, Chara and Christos J. Pierrakeas and Kameas, Achilles}
}
@article {solomou2015international,
	title = {International Forum of Educational Technology \& Society},
	journal = {Journal of Educational Technology \& Society},
	volume = {18},
	number = {4},
	year = {2015},
	pages = {246{\textendash}260},
	author = {Solomou, Georgia and Christos J. Pierrakeas and Kameas, Achilles}
}
@conference {spyropoulou2014clarifying,
	title = {Clarifying the digital content output formats for mobile learning in higher education},
	booktitle = {Interactive Mobile Communication Technologies and Learning (IMCL), 2014 International Conference on},
	year = {2014},
	pages = {139{\textendash}146},
	publisher = {IEEE},
	organization = {IEEE},
	author = {Spyropoulou, Natalia and Karathanasis, Ioannis and Christos J. Pierrakeas and Kameas, Achilles}
}
@article {spyropoulou2014creating,
	title = {CREATING MOOC GUIDELINES BASED ON BEST PRACTICES},
	journal = {EDULEARN14 Proceedings},
	year = {2014},
	pages = {6981{\textendash}6990},
	publisher = {IATED},
	author = {Spyropoulou, Natalia and Christos J. Pierrakeas and Kameas, Achilles}
}
@conference {aggelopoulou2014ontological,
	title = {Ontological Modelling for Intelligent e-Learning},
	year = {2014},
	author = {Aggelopoulou, Niki and Christos J. Pierrakeas and Artikis, Alexander and Kalles, Dimitris}
}
@conference {pierrakeas2013correlation,
	title = {A correlation verb (CorrVerb) ontology for object properties specification within knowledge domain representations},
	booktitle = {Proceedings of the 6th Balkan Conference in Informatics},
	year = {2013},
	pages = {195{\textendash}200},
	publisher = {ACM},
	organization = {ACM},
	author = {Christos J. Pierrakeas and Panagiotopoulos, Ioannis and Kameas, Achilles}
}
@conference {nikolopoulos2012creating,
	title = {Creating a LO Metadata Profile for Distance Learning: An Ontological Approach.},
	booktitle = {MTSR},
	year = {2012},
	pages = {37{\textendash}48},
	author = {Nikolopoulos, George and Kalou, Aikaterini K and Christos J. Pierrakeas and Kameas, Achilles}
}
@conference {spanaka2012experience,
	title = {Experience from designing and applying collaborative learning services in distance adult education},
	year = {2012},
	author = {Spanaka, Adamantia and Christos J. Pierrakeas and Kameas, Achilles}
}
@conference {nikolopoulos2012modeling,
	title = {Modeling the characteristics of a learning object for use within e-learning applications},
	booktitle = {Proceedings of the Fifth Balkan Conference in Informatics},
	year = {2012},
	pages = {112{\textendash}117},
	publisher = {ACM},
	organization = {ACM},
	author = {Nikolopoulos, George and Solomou, Georgia and Christos J. Pierrakeas and Kameas, Achilles}
}
@inbook {kouneli2012modeling,
	title = {Modeling the knowledge domain of the java programming language as an ontology},
	booktitle = {Advances in Web-Based Learning-ICWL 2012},
	year = {2012},
	pages = {152{\textendash}159},
	publisher = {Springer},
	organization = {Springer},
	author = {Kouneli, Aggeliki and Solomou, Georgia and Christos J. Pierrakeas and Kameas, Achilles}
}
@inbook {panagiotopoulos2012ontological,
	title = {An Ontological Approach for Domain Knowledge Modeling and Management in E-Learning Systems},
	booktitle = {Artificial Intelligence Applications and Innovations},
	year = {2012},
	pages = {95{\textendash}104},
	publisher = {Springer},
	organization = {Springer},
	author = {Panagiotopoulos, Ioannis and Kalou, Aikaterini and Christos J. Pierrakeas and Kameas, Achilles}
}
@article {pierrakeas2012ontological,
	title = {An Ontological Approach in Learning Programming Languages},
	year = {2012},
	author = {Christos J. Pierrakeas and Solomou, Georgia and Kameas, Achilles}
}
@conference {kalou2012ontology,
	title = {An Ontology Model for Building, Classifying and Using Learning Outcomes},
	booktitle = {Advanced Learning Technologies (ICALT), 2012 IEEE 12th International Conference on},
	year = {2012},
	pages = {61{\textendash}65},
	publisher = {IEEE},
	organization = {IEEE},
	author = {Kalou, Aikaterini and Solomou, Georgia and Christos J. Pierrakeas and Kameas, Achilles}
}
@conference {pierrakeas2012ontology,
	title = {An Ontology-Based Approach in Learning Programming Languages},
	booktitle = {Informatics (PCI), 2012 16th Panhellenic Conference on},
	year = {2012},
	pages = {393{\textendash}398},
	publisher = {IEEE},
	organization = {IEEE},
	author = {Christos J. Pierrakeas and Solomou, Georgia and Kameas, Achilles}
}
@inbook {panagiotopoulos2012ontology,
	title = {An Ontology-Based Model for Student Representation in Intelligent Tutoring Systems for Distance Learning},
	booktitle = {Artificial Intelligence Applications and Innovations},
	year = {2012},
	pages = {296{\textendash}305},
	publisher = {Springer Berlin Heidelberg},
	organization = {Springer Berlin Heidelberg},
	author = {Panagiotopoulos, Ioannis and Kalou, Aikaterini and Christos J. Pierrakeas and Kameas, Achilles}
}
@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 {theodoratou2009culture,
	title = {Culture specific stress coping strategies used to alleviate occupational stress among Greek nursing personnel},
	journal = {Journal of Medical Psychology},
	volume = {1},
	number = {1},
	year = {2009},
	pages = {21},
	publisher = {Renaissance Medical Publishing},
	author = {Theodoratou, Maria and Andreopoulou, Ourania and Bekos, Vassilis and Christos J. Pierrakeas and Skiadopoulos, Spyros}
}
@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}
}
@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}
}
@conference {pierrakeas2008managing,
	title = {Managing Large Scale Development of Educational Software},
	year = {2008},
	author = {Christos J. Pierrakeas}
}
@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 {pierrakeas2007telemedicine,
	title = {Telemedicine applications of speech pathology based on online collaboration environments},
	booktitle = {World Congress on Medical Physics and Biomedical Engineering 2006},
	year = {2007},
	pages = {350{\textendash}353},
	publisher = {Springer},
	organization = {Springer},
	author = {Christos J. Pierrakeas and Georgopoulos, VC and Malandraki, GA}
}
@article {kalles2006analyzing,
	title = {Analyzing student performance in distance learning with genetic algorithms and decision trees},
	journal = {Applied Artificial Intelligence},
	volume = {20},
	number = {8},
	year = {2006},
	pages = {655{\textendash}674},
	publisher = {Taylor \& Francis},
	author = {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}
}
@article {frangides2006snake,
	title = {Snake venom poisoning in Greece. Experiences with 147 cases},
	journal = {European journal of internal medicine},
	volume = {17},
	number = {1},
	year = {2006},
	pages = {24{\textendash}27},
	publisher = {Elsevier},
	author = {Frangides, Christos Y and Koulouras, Vasilios and Kouni, Sophia N and Tzortzatos, Gerasimos V and Nikolaou, Athanasios and Pneumaticos, John and Christos J. Pierrakeas and Niarchos, Constantinos and Kounis, Nicholas G and Koutsojannis, Constantinos M}
}
@inbook {kalles2006using,
	title = {Using genetic algorithms and decision trees for a posteriori analysis and evaluation of tutoring practices based on student failure models},
	booktitle = {Artificial Intelligence Applications and Innovations},
	year = {2006},
	pages = {9{\textendash}18},
	publisher = {Springer},
	organization = {Springer},
	author = {Kalles, Dimitris and Christos J. Pierrakeas}
}
@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 {pierrakeas2004comparative,
	title = {A comparative study of dropout rates and causes for two different distance education courses},
	journal = {The International Review of Research in Open and Distributed Learning},
	volume = {5},
	number = {2},
	year = {2004},
	author = {Christos J. Pierrakeas and Xeno, Michalis and Panagiotakopoulos, Christos and Vergidis, Dimitris}
}
@article {kotsiantis2004predicting,
	title = {PREDICTING STUDENTS{\textquoteright}PERFORMANCE IN DISTANCE LEARNING USING MACHINE LEARNING TECHNIQUES},
	journal = {Applied Artificial Intelligence},
	volume = {18},
	number = {5},
	year = {2004},
	pages = {411{\textendash}426},
	publisher = {Taylor \& Francis},
	author = {Kotsiantis, S and Christos J. Pierrakeas and Pintelas, P}
}
@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}
}
