Construction of the energy matrix for complex atoms Part IV: Excitation of one electron from a closed shell into an open shellMagdalena Elantkowska, Jarosław Ruczkowski and Jerzy DembczyńskiEur. Phys. J. Plus, 130 8 (2015) 170DOI: https://doi.org/10.1140/epjp/i2015-15170-9