If you are interested in multireference methods that can be applied to large systems, then you can check out a new paper by us: "
Local Electron Correlation Treatment in Extended Multireference Calculations: Effect of Acceptor-Donor Substituents on the Biradical Character of the Polyaromatic Hydrocarbon Heptazethrene" in JCTC. The paper reports a locally correlated implementation for the multireference configuration interaction method. The code is available within the
COLUMBUS program package.
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