@mastersthesis{mastersthesis22cf5575,
title   = {Hierarchical semi-supervised confidence-based active clustering and its application to the extraction of topic hierarchies from document collections},
author = {Nogueira, Bruno Magalhães and Jorge, Alípio Mário Guedes and Rezende, Solange Oliveira},
year = {2013},
school = {Universidade de São Paulo}
}