Sentiment analysis of greek tweets and hashtags using a sentiment lexicon. - Georgios Kalamatianos; Dimitrios Mallis; Symeon Symeonidis; Avi Arampatzis (Panhellenic Conference on Informatics, 2015)

Recommending Points-of-Interest via Weighted kNN, Rated Rocchio, and Borda Count Fusion. - Georgios Kalamatianos; Avi Arampatzis (TREC, 2016)

Towards the creation of an emotion lexicon for microblogging. - Georgios Kalamatianos; Symeon Symeonidis; Dimitrios Mallis; Avi Arampatzis (J. Syst. Inf. Technol., 2018)

Suggesting Points-of-Interest via Content-Based, Collaborative, and Hybrid Fusion Methods in Mobile Devices. - Avi Arampatzis; Georgios Kalamatianos (ACM Trans. Inf. Syst., 2018)

Diversified spatial keyword search on RDF data. - Zhi Cai; Georgios Kalamatianos; Georgios John Fakas; Nikos Mamoulis; Dimitris Papadias (VLDB J., 2020)

Proportionality in Spatial Keyword Search. - Georgios Kalamatianos; Georgios John Fakas; Nikos Mamoulis (SIGMOD Conference, 2021)

Diversified Retrieval of Spatial Data with Context. - Georgios Kalamatianos (2022)

Proportionality on Spatial Data with Context. - Georgios John Fakas; Georgios Kalamatianos (ACM Trans. Database Syst., 2023)