Keuper, Ralf; Risch, Nikolaus Liebigs Annales, 1996 , # 5 p. 717 - 723 Title/Abstract Full Text View citing articles Show Details Sielemann, Dirk; Keuper, Ralf; Risch, Nikolaus Advanced Synthesis and Catalysis, 1999 , vol. 341, # 5 p. 487 - 491