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Electronic States of Molecules and Atom Clusters [E-Book] : Foundations and Prospects of Semiempirical Methods /
Table of Contents: ... orbital bases -- 5.4 ?-Electron models and the ?-? separation -- 5.5 Basis problem in solid-state physics -- 5.6 Metal-metal bond and the X? method -- 5.7 Reliability of computations and choice of the orbital basis -- 5.8 A comment on the use of group theory...

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