@misc{251141, author = {James Sims}, title = {Hylleraas-configuration-interaction non-relativistic energies for the 3 singlet S, 4 singlet S, 5 singlet S, 6 singlet S, and 7 singlet S excited states of the beryllium atom}, year = {2020}, number = {125}, month = {2020-02-05}, publisher = {Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/jres.125.006}, language = {en}, }