This excerpt taken from the LUX 20-F filed Jun 28, 2006.
EURIBOR means, in relation to any Loan in euro:
(a) the applicable Screen Rate; or
(b) (if no Screen Rate is available for the Interest Period of that Loan) the arithmetic mean of the rates (rounded upwards to four decimal places) as supplied to the Italian Agent at its request quoted by the Reference Banks to leading banks in the European interbank market;
as of the Specified Time on the Quotation Day for the offering of deposits in euro for a period comparable to the Interest Period of the relevant Loan.