Hierarchy CI has been described in [J. Phys. Chem. Lett. 2022, 13, 19, 4342–4349](https://doi.org/10.1021/acs.jpclett.2c00730). It has been recently extended to seniority and hierarchy based CI in [J. Chem. Theory Comput, doi:10.1021/acs.jctc.3c00946 (2023)](https://doi.org/10.1021/acs.jctc.3c00946). Since MACIS contains a high-throughput CI engine, these CI models might be interesting to have as well.