@article{xamena2017structural,
title = "A Structural Analysis of topic ontologies",
author = "Xamena, Eduardo and Brignole, N{\'e}lida Beatriz and Maguitman, Ana Gabriela",
journal = "Information Sciences",
volume = "421",
pages = "15--29",
year = "2017",
publisher = "Elsevier",
url = "http://www.sciencedirect.com/science/article/pii/S0020025516320898",
}