Hidden-crossing explanation of frozen-planet resonances in antiprotonic helium; their positions and widths Tasko P. Grozdanov and Evgeni A. Solov’ev Eur. Phys. J. D, 74 3 (2020) 50 Published online: 17 March 2020 DOI: 10.1140/epjd/e2020-100565-0