@inbook {13561,
	title = {Sentiment Analysis of Hotel Reviews in Greek: A Comparison of Unigram Features},
	booktitle = {Cultural Tourism in a Digital Era },
	year = {2015},
	pages = {373-384},
	publisher = {Springer},
	organization = {Springer},
	address = {Heidelberg},
	author = {Georgios Markopoulos and Mikros, George and Iliadi, A. and Liontos, M.},
	editor = {Katsoni, V.}
}
