Contact the authors

Dr. Emil Krén is a retired scientist in solid state physics from the Central Research Institute for Physics (KFKI), Budapest, presently consultant in information technology at various companies.

You can contact him at kren@mail.kfki.hu

Dr. Dániel Marx is a researcher at the Institute for Computer Science and Control, Hungarian Academy of Sciences, Budapest, Hungary.

You can contact him at marx@inf.bme.hu

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