Corresponding Author

Paper:	idn615
Name:	J_M. Casagrande
Company:	Thomson Tubes Electroniques
Address:	Z.I. Centr'Alp 38430 Moirans
Country:	France
Phone:	0033 4 7657 4182
Fax:	0033 4 7657 4066
Email:	casagrande@tte.thomson-csf.com