Structural modifications of two-electron systems under isotropic harmonic confinement Ashoke Hazra, Santanu Mondal, Sukhamoy Bhattacharyya, Jayanta K. Saha and K. D. Sen Eur. Phys. J. D, 75 6 (2021) 186 Published online: 28 June 2021 DOI: 10.1140/epjd/s10053-021-00196-3