@conference {267,
	title = {Is this Sentence Difficult? Do you Agree?},
	booktitle = {Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing},
	year = {2018},
	author = {Brunato, Dominique and De Mattei, Lorenzo and Dell{\textquoteright}Orletta, Felice and Iavarone, Benedetta and Venturi, Giulia}
}
