References
- Leblé , A. , Rousseau , J. J. , Fayet , J. C. , Pannetier , J. , Fourquet , J. L. and De Pape , R. 1982 . Phys. Stat. Sol. , 69 : 249
- Bulou , A. (private communication)
- Dagorn , Y. , Leblé , A. , Rousseau , J. J. and Fayet , J. C. Sol. State Com , (to be published)