Symmetric vs. Asymmetric Linear M-X-M Linkages in Molecules, Polymers and Extended Networks

R. A. Wheeler, M.-H. Whangbo, T. Hughbanks, R. Hoffmann, J. K. Burdett and T. A. Albright, J. Amer. Chem. Soc., 108, 2222-2236 (1986).