@inbook {sordoni_looking_2014,
	title = {Looking at Vector Space and Language Models for IR Using Density Matrices},
	booktitle = {Quantum Interaction},
	year = {2014},
	pages = {147{\textendash}159},
	publisher = {Springer Berlin Heidelberg},
	organization = {Springer Berlin Heidelberg},
	url = {http://link.springer.com/chapter/10.1007/978-3-642-54943-4_13},
	author = {Sordoni, Alessandro and Jian-Yun Nie}
}
