Detecting tip spam in location-based social networks. - Helen Costa; Fabrício Benevenuto; Luiz Henrique de Campos Merschmann (SAC, 2013)

Pollution, bad-mouthing, and local marketing: The underground of location-based social networks. - Helen Costa; Luiz Henrique de Campos Merschmann; Fabrício Barth; Fabrício Benevenuto (Inf. Sci., 2014)

On the combination of "off-the-shelf" sentiment analysis methods. - Pollyanna Gonçalves; Daniel Hasan Dalip; Helen Costa; Marcos André Gonçalves; Fabrício Benevenuto (SAC, 2016)

A VNS algorithm for feature selection in hierarchical classification context. - Helen Costa; Leandro Galvão 002; Luiz H. C. Merschmann; Marcone J. F. Souza (Electron. Notes Discret. Math., 2018)

A Novel Hybrid Feature Selection Algorithm for Hierarchical Classification. - Helen Costa; Fernando E. B. Otero; Luiz H. C. Merschmann; Marcone J. F. Souza (IEEE Access, 2021)