1. AbdollahzadehAhangar, H., Chellali, M., Sheikholeslami, S.M.: On the double Roman domination in graphs. Discrete Appl. Math. 232, 1–7 (2017)
2. Abdollahzadeh Ahangar, H., Chellali, M., Sheikholeslami, S.M.: Outer independent double Roman domination. Appl. Math. Comput. 364, 124617 (2020)
3. Akhoundi, M., Khan, A., Shafi, J., Volkmann, L.: Quasi total double Roman domination in trees. Commun. Comb. Optim. 9, 159–168 (2024)
4. Amjadi, J., Nazari-Moghaddam, S., Sheikholeslami, S.M., Volkmann, L.: An upper bound on the double Roman domination number. J. Comb. Optim. 36, 81–89 (2018)
5. Beeler, R.A., Haynes, T.W., Hedetniemi, S.T.: Double Roman domination. Discrete Appl. Math. 211, 23–29 (2016)