Title Lower Bounds on Signed Total Double Roman k-domination in Graphs Type of Research Article Keywords Lower Bounds on Signed Total Double Roman k-domination in Graphs Abstract Lower Bounds on Signed Total Double Roman k-domination in Graphs Researchers Leila Shahbazi (First Researcher)، Hossein Abdollahzadeh Ahangar (Second Researcher)، Rana Khoeilar (Third Researcher)، Seyed Mahmoud Sheikholeslami Kavkani (Fourth Researcher)