Frozen-planet resonances in doubly excited helium atom; adiabatic approachTasko P. Grozdanov, Alexander A. Gusev, Evgeni A. Solov’ev and Sergue I. VinitskyEur. Phys. J. D, 74 7 (2020) 161DOI: https://doi.org/10.1140/epjd/e2020-10202-9