Properties of doubly excited states of H- and He associated with the manifolds from N = 6 up to N = 25S. I. Themelis, Y. Komninos and C. A. NicolaidesEur. Phys. J. D, 18 3 (2002) 277-293DOI: https://doi.org/10.1140/epjd/e20020032