Johansen, M. B., Buchwald, T. J. V., Dünweber, P. G. I. L., Olsen, L. H., Hillers-Bendtsen, A. E., Kjeldal, F. Ã., Olsen, J., Jørgensen, P., Mikkelsen, K. V. (2025). Cluster perturbation theory. XII. Parallel implementation of variational excitation energy series for the coupled cluster singles and doubles model. The Journal of Chemical Physics. https://doi.org/10.1063/5.0271032