1: Greenwood,N.N., Earnshaw,A. Chemistry of the elements
2nd edition (1997) Edited by Greenwood,N.N., Earnshaw,A. pp. 1-1340, Butterworth-Heinemann. Oxford. Great Britain

2: CRC Handbook of Chemistry and Physics
75th edition (1994) Edited by Lide,D.R. , CRC Press Inc. Boca Raton, USA

3: IUPAC Adopts Final Recommendations for Names of Transfermium Elements
IUPAC Press Release 30 August 1997

4: John Emsley. Nature's Building Blocks: An A-Z Guide to the Elements
Oxford University Press (2001)