@conference {550,
	title = {DS4: A Distributed Social and Semantic Search System},
	booktitle = {Proceedings of 35th European Conference on Information Retrieval (ECIR)},
	year = {2013},
	month = {March},
	address = {Moscow, Russia},
	author = {Dionisis Kontominas and Paraskevi Raftopoulou and Christos Tryfonopoulos and E.G.M. Petrakis}
}
