Energy Resonances for $^1P^o,$ $^1D^e,$ $^1F^o,$ $^1G^e,$ and $^1H^o$ Autoionizing States of the Helium Isoelectronic Series Below the $n=2-4$ Hydrogenic Thresholds. (2018). Journal of Atomic and Molecular Sciences, 2(1), 20-42. https://doi.org/10.4208/jams.062910.072810a