MSR is W[1]-hard parameterized by k+Delta on weighted bipartite graphs and by vertex cover number plus k, but FPT parameterized by treewidth plus Delta on weighted graphs.
30 Dániel Marx
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On the Parameterized Complexity of Min-Sum-Radii
MSR is W[1]-hard parameterized by k+Delta on weighted bipartite graphs and by vertex cover number plus k, but FPT parameterized by treewidth plus Delta on weighted graphs.