Title An Upper Bound on the Total Roman {2}-domination Number of Graphs with Minimum Degree Two Type of Research Article Keywords An Upper Bound on the Total Roman {2}-domination Number of Graphs with Minimum Degree Two Abstract An Upper Bound on the Total Roman {2}-domination Number of Graphs with Minimum Degree Two Researchers (First Researcher)، Hossein Abdollahzadeh Ahangar (Second Researcher)، Rana Khoeilar (Third Researcher)، Seyed Mahmoud Sheikholeslami Kavkani (Fourth Researcher)