1. H. Abdollahzadeh Ahangar, J. Amjadi, M. Atapour, M. Chellali, S.M. Sheikholeslami, Double Roman trees, Ars Combin., to appear.
2. Maximal Roman domination numbers in graphs;Abdollahzadeh Ahangar;Util. Math.,2017
3. Mixed Roman domination in graphs;Abdollahzadeh Ahangar;Bull. Malays. Math. Sci. Soc.,2015
4. Double Roman domination;Beeler;Discrete Appl. Math.,2016
5. Roman {2}-domination;Chellali;Discrete Appl. Math.,2016