I. Sakho. (1970). General Formalism of the Modified Atomic Orbital Theory for the Rydberg Series of Atoms and Ions: Application to the Photoionization of $Ne^+$.
            <i>Journal of Atomic and Molecular Sciences</i>. <i>5</i> (3).
            206-216.
         doi:10.4208/jams.110813.021414a