Construction of the energy matrix for complex atoms Part III: Excitation of two equivalent electrons from a closed shell into an open shell or an empty shellMagdalena Elantkowska, Jarosław Ruczkowski and Jerzy DembczyńskiEur. Phys. J. Plus, 130 4 (2015) 83DOI: https://doi.org/10.1140/epjp/i2015-15083-7