Spectroscopic peculiarities in a 2D Coulomb potential under Aharonov-Bohm effect Peter A. Meleshenko, Hang T.T. Nguyen and Alexander F. Klinskikh Eur. Phys. J. D, 67 10 (2013) 209 Published online: 18 October 2013 DOI: 10.1140/epjd/e2013-40265-4