Multi-objective optimization algorithms applied to residential building retrofitting at district scale: BRIOTOOLGema Hernández-Moral, Víctor Iván Serna-González, Alejandro Martín Crespo and Sergio Saludes RodilE3S Web Conf., 362 (2022) 03002DOI: https://doi.org/10.1051/e3sconf/202236203002