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Zhai, H.-J.; Alexandrova, A.N.; Birch, K.A.; Boldyrev, A.I.; Wang, L.-S., Hepota- and Octacoordinate Boron in Molecular Wheels of eight and Nine-Atom Boron Clusters: Observation and Confirmation, Angew. Chem.Intl. Ed., 2003, 42, 48, 6004, https://doi.org/10.1002/anie.200351874 . [all data]