Gradiant-Analytics: Training Polarity Shifters with CRFs for Message Level Polarity Detection. - Héctor Cerezo-Costas; Diego Celix-Salgado (SemEval@NAACL-HLT, 2015)

GTI-Gradiant at TASS 2015: A Hybrid Approach for Sentiment Analysis in Twitter. - Tamara Álvarez-López; Jonathan Juncal-Martínez; Milagros Fernández Gavilanes; Enrique Costa-Montenegro; Francisco Javier González-Castaño; Héctor Cerezo-Costas; Diego Celix-Salgado (TASS@SEPLN, 2015)