issue 1 publication date 2019-06-01

• Strong Alliances in Graphs
• New skew equienergetic oriented graphs
• Eternal m-security subdivision numbers in graphs
• On the inverse maximum perfect matching problem under the bottleneck-type Hamming distance
• The Roman domination and domatic numbers of a digraph
• The Italian domatic number of a digraph
• On independent domination numbers of grid and toroidal grid directed graphs