Volume 288, Issue 1, 11 June 1985, Pages 63-67, Ferdinand R. W. P. Wild, Marek Wasiucionek, Gottfried Huttner and Hans H. Brintzinger, "ansa-Metallocene derivatives : VII. Synthesis and crystal structure of a chiral ansa-zirconocene derivative with ethylene-bridged tetrahydroindenyl ligands"
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http://dx.doi.org/10.1016/0022-328X(85)80104-2