Title Maximal double Roman domination in graphs Type of Research Article Keywords Maximal double Roman domination in graphs Abstract Maximal double Roman domination in graphs Researchers Hossein Abdollahzadeh Ahangar (First Researcher)، Mustapha Chellali (Second Researcher)، Seyed Mahmoud Sheikholeslami Kavkani (Third Researcher)، Valenzuela-Tripodoro Valenzuela-Tripodoro (Fourth Researcher)