Optimal bilinear control problem related to a chemo-repulsion system in 2D domains Francisco Guillén-González, Exequiel Mallea-Zepeda and María Ángeles Rodríguez-Bellido ESAIM: COCV, 26 (2020) 29 Published online: 24 March 2020 DOI: 10.1051/cocv/2019012