On Groups all of whose Undirected Cayley Graphs of Bounded Valency are Integral. - István Estélyi; István Kovács (Electron. J. Comb., 2014)

Which Haar graphs are Cayley graphs? - István Estélyi; Tomaz Pisanski (Electron. J. Comb., 2016)

On a representation of the automorphism group of a graph in a unimodular group. - István Estélyi; Ján Karabás; Roman Nedela; Alexander D. Mednykh (Discret. Math., 2021)

The Jacobian of a graph and graph automorphisms. - István Estélyi; Ján Karabás; Alexander D. Mednykh; Roman Nedela (Discret. Math., 2025)