Using of a weighted directed acyclic graph for major repairs of real estate objects: the optimal combination of energy-efficient measures introductionElena Gorbaneva, Valery Mishchenko, Kristina Sevryukova and Elena OvchinnikovaE3S Web Conf., 258 (2021) 09051DOI: https://doi.org/10.1051/e3sconf/202125809051