Multiple interval graphs are a well-known generalization of interval gra...
In a digraph, a quasi-kernel is a subset of vertices that is independent...
A partition (V_1,...,V_k) of the vertex set of a graph G with a (not
nec...
A permutation is said to be a square if it can be obtained by shuffling ...
We investigate a variant of the so-called "Internet Shopping Problem"
in...
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