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math.GR2014
On groups all of whose undirected Cayley graphs of bounded valency are integral
István Estélyi, István Kovács
A finite group is called Cayley integral if all undirected Cayley graphs over are integral, i.e., all eigenvalues of the graphs are integers. The Cayley integral groups hav…
math.MG2014
Multiple coverings with closed polygons
István Kovács, Géza Tóth
A planar set is said to be cover-decomposable if there is a constant such that every -fold covering of the plane with translates of can be decomposed into two c…