Extremely Strong s(2) - s(2) Closed-Shell Interactions This work was supported by the Auckland University Research Committee, the Deutsche Forschungsgemeinschaft (DFG), and the Marsden Fund managed by the Royal Society of New Zealand. We are grateful to Prof. W. H. E. Schwarz (Siegen) for his critical and most valuable comments.
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Department of Chemistry University of Auckland Private Bag 92019, Auckland (New Zealand).
Schwerdtfeger
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