@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 {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}
}
