Hydrogenic impurity states in CdSe/ZnS and ZnS/CdSe core-shell nanodots with dielectric mismatchM. Cristea and E.C. NiculescuEur. Phys. J. B, 85 6 (2012) 191DOI: https://doi.org/10.1140/epjb/e2012-21051-2