Necessary optimality conditions for a fractional multiobjective optimization problemNazih Abderrazzak Gadhi, Khadija Hamdaoui, Mohammed El Idrissi and Fatima Zahra RahouRAIRO-Oper. Res., 55 (2021) S1037-S1049DOI: https://doi.org/10.1051/ro/2020049