When, where and how to estimate persistent and transient efficiency in stochastic frontier panel data models. - Oleg Badunenko; Subal C. Kumbhakar (Eur. J. Oper. Res., 2016)

Economies of scale, technical change and persistent and time-varying cost efficiency in Indian banking: Do ownership, regulation and heterogeneity matter? - Oleg Badunenko; Subal C. Kumbhakar (Eur. J. Oper. Res., 2017)

Statistical inference for the Russell measure of technical efficiency. - Oleg Badunenko; Pavlo Mozharovskyi (J. Oper. Res. Soc., 2020)

Achieving a sustainable cost-efficient business model in banking: The case of European commercial banks. - Oleg Badunenko; Subal C. Kumbhakar; Ana Lozano-Vivas (Eur. J. Oper. Res., 2021)

On distinguishing the direct causal effect of an intervention from its efficiency-enhancing effects. - Oleg Badunenko; Giovanna D'Inverno; Kristof De Witte (Eur. J. Oper. Res., 2023)