Advancing group efficiency evaluation in DEA with negative data: an empirical application in the banking industryLeila Kolahdoozi, Reza Kazemi Matin, Ghasem Tohidi and Shabnam RazavyanRAIRO-Oper. Res., 58 3 (2024) 2525-2541DOI: https://doi.org/10.1051/ro/2024089
