Conservation of the number of nodes in the wavefunctions of one-electron diatomic quasimolecules Tamaz Kereselidze and Irakli Noselidze Eur. Phys. J. D, 78 11 (2024) 134 Published online: 11 November 2024 DOI: 10.1140/epjd/s10053-024-00923-6