1. , , , Advances in Inorganic Chemistry, 6. Aufl., Wiley, London, 1999, Kap. 1;
2. , Chemistry of the Elements, Pergamon Press, Oxford, 1990, Kap. 19.
3. [Mo(CH3)6] und [Mo(CH3)7]−
4. [Mo(CH3)6] and [Mo(CH3)7]
5. Preparation and Structures of [W(CH3)6], [Re(CH3)6], [Nb(CH3)6]−, and [Ta(CH3)6]−