Title On the Outer-Independent Double Roman Domination of Graphs Type of Research Article Keywords On the Outer-Independent Double Roman Domination of Graphs Abstract On the Outer-Independent Double Roman Domination of Graphs Researchers Yongsheng Rao (First Researcher)، saeed kosari (Second Researcher)، Seyed Mahmoud Sheikholeslami Kavkani (Third Researcher)، Mustapha Chellali (Fourth Researcher)، (Fifth Researcher)