Marco Gonzalez,  Ana Martins,  Fernanda Barao,  Marceu Leite,  Vera L. S. de Lima. 

This paper presents a contribution to identification of themes and subthemes of Portuguese texts. We build hierarchical structures with terms extracted from a text, trying to define the order of their relative importance and the way how they group. We use techniques, such as stemming, extraction of lexical relations, and frequency weighting; as well as techniques from algorithms and data structures, such as construction of maximum spanning trees.

http://www.lbd.dcc.ufmg.br/colecoes/til/2003/0034.pdf

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