1. G. Salvini:On the possibility of using solar energy for future accelerators, CERN Internal Report 78-1.
2. G. Salvini andR. Visentin:Lett. Nuovo Cimento,20, 367 (1977).
3. G. A. Rottigni:Appl. Opt.,17, 969 (1978).
4. G. A. Rottigni:Nuovo Cimento C,1, 197 (1978).
5. F. James andM. Roos:MINUIT. A system for minimizing a function of n parameters and computing the parameter errors and correlations, CERN Computer Centre (Language Fortran).