“…Similarly, Zhang et al (2021) investigated Chinese regional industrial systems using the DEA approach. Firsova and Chernyshova (2018), Zemtsov and Kotsemir (2019) and Dzyubenko (2021) incorporated the DEA method to calculate the efficiency of regional innovation systems in Russia. Other DEA‐based studies analysing regional efficiency can be seen in various areas of application, such as agriculture (Toma et al, 2015), healthcare (Stefko et al, 2018), water management (Deng et al, 2016), research and development (R&D) (Aristovnik, 2014), as well as in many countries such as Croatia (Škare & Rabar, 2016), Spain (Solana‐Ibáñez et al, 2016), Greece (Karakitsiou et al, 2020), Serbia (Radonjić, 2020), Poland (Miszczyńska & Miszczyński, 2021).…”