Original Research Published on 05 Feb 2021 On the Outer-Independent Double Roman Domination of Graphs in Optimization Yongsheng RaoSaeed KosariSeyed Mahmoud SheikholeslamiM. ChellaliMahla Kheibari Frontiers in Applied Mathematics and Statistics doi 10.3389/fams.2020.559132 3,439 views 3 citations