References
- Batlogg , B. , Kaldis , E. , Schlegel , A. and Wachter , P. 1975 . Phys. Rev. B , 12 : 3940
- Berkooz , O. , Malamud , M. and Shtrikman , S. 1968 . Solid St. Commun. , 5 : 185
- Carter , F. L. 1977 . J. Solid St. Chem. , 5 : 300
- Davis , H. H. , Bransky , I. and Tallan , N. M. 1970 . J. less common Metals , 22 : 193
- Wachter , P. 1977 . Valence Instabilities and Related Narrow Band Phenomena , Edited by: Parks , R. D. 337 New York : Plenum .