1. European Journal of Inorganic Chemistry, Volume 2001, Issue 11, pages 2885–2890, November 2001
Perdita Arndt, Anke Spannenberg, Wolfgang Baumann, Sigurd Becke, Uwe Rosenthal, "Bimetallic Titanocene or Zirconocene/Aluminium Complexes as Active Catalysts in Lactone Polymerization Reactions"
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http://dx.doi.org/10.1002/1099-0682(200111)2001:11<2885::AID-EJIC2885>3.0.CO;2-9Volume 655, Issues 1-2, 1 August 2002, Pages 16-22, Diego del Río and Agustín Galindo, "Theoretical study of the bonding capabilities of 1,4-diaza-1,3-butadiene and cis-1,3-butadiene ligands in cyclopentadienyl tantalum(V) complexes "
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http://dx.doi.org/10.1016/S0022-328X(02)01404-3Заранее спасибо!