Before revision: Günter Petzow, Fritz Aldinger, Sigurd Jönsson, Peter Welge, Vera van Kampen, Thomas Mensing, Thomas Brüning "Beryllium and Beryllium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry 2005 , Wiley-VCH, Weinheim.
After revision: Petzow, Günter; Aldinger, Fritz; Jönsson, Sigurd; Welge, Peter; van Kampen, Vera; Mensing, Thomas Brüning "Beryllium and Beryllium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry ;, Thomas (2005) , Wiley-VCH, Weinheim.