Excitons in spherical quantum dots revisited: analysis of colloidal nanocrystals R.L. Restrepo, Walter Antonio Ospina-Muñoz, E. Feddi, M.E. Mora-Ramos, J.A. Vinasco, A.L. Morales and C.A. Duque Eur. Phys. J. B, 93 6 (2020) 109 Published online: 15 June 2020 DOI: 10.1140/epjb/e2020-10078-5