The informational value of employee online reviews. - Efthymia Symitsi; Panagiotis Stamolampros; George Daskalakis; Nikolaos Korfiatis (Eur. J. Oper. Res., 2021)

Employee sentiment index: Predicting stock returns with online employee data. - Efthymia Symitsi; Panagiotis Stamolampros (Expert Syst. Appl., 2021)

Keyword portfolio optimization in paid search advertising. - Efthymia Symitsi; Raphael N. Markellos; Murali K. Mantrala (Eur. J. Oper. Res., 2022)