issue 1 publication date 2021-06-01

• Weak signed Roman k-domination in graphs
• Twin signed total Roman domatic numbers in digraphs
• A generalized form of the Hermite-Hadamard-Fejer type inequalities involving fractional integral for co-ordinated convex functions
• A note on the first Zagreb index and coindex of graphs
• The upper domatic number of powers of graphs
• Independent domination in directed graphs
• A note on polyomino chains with extremum general sum-connectivity index
• A survey of the studies on Gallai and anti-Gallai graphs
• On the extremal total irregularity index of n-vertex trees with fixed maximum degree
• Bounds on the outer-independent double Italian domination number
• Relationships between Randic index and other topological indices
• On Zagreb Energy and edge-Zagreb energy