Mojdeh DA, Teymourzadeh A. An upper bound on the total double Roman domination number. J. Algebra Comb. Discrete Struct. Appl. [Internet]. 2026 Oct. 18 [cited 2026 Oct. 20];14(1):31-40. Available from: https://www.jacodesmath.com/index.php/jacodesmath/article/view/204