Apfel, Ulf-Peter; Troegel, Dennis; Halpin, Yvonne; Tschierlei, Stefanie; Uhlemann, Ute; Goerls, Helmar; Schmitt, Michael; Popp, Juergen; Dunne, Peter; Venkatesan, Munuswamy; Coey, Michael; Rudolph, Manfred; Vos, Johannes G.; Tacke, Reinhold; Weigand, Wolfgang Inorganic Chemistry, 2010 , vol. 49, # 21 p. 10117 - 10132