1. National Institute of Research and Development for Isotopic and Molecular Technologies, Department of Molecular and Biomolecular Physics, 400293, Cluj-Napoca, Romania
2. Romanian Academy of Scientists, 54, Splaiul Independenţei, Sector 5, 050094 Bucharest, Romania
3. T. Popoviciu Institute of Numerical Analysis, Romanian Academy, 400110 Cluj-Napoca, Romania
4. Astronomical Institute of the Romanian Academy, Astronomical Observatory Cluj-Napoca, 19 Cireşilor, 400487 Cluj-Napoca, Romania