Papachristopoulos, Leonidas, Pantelis Ampatzoglou, Ioanna Seferli, Andriani Zafeiropoulou, & Georgios Petasis. " Introducing Sentiment Analysis for the Evaluation of Library’s Services Effectiveness." Qualitative and Quantitative Methods in Libraries [Online], 8.1 (2019): 99-110. Web. 26 Apr. 2024