This excerpt taken from the LUX 20-F filed Jun 28, 2006.
Calculation of interest
The rate of interest on each Loan for each Interest Period is the percentage rate per annum which is the aggregate of the applicable:
(b) in relation to any Loan in euro, EURIBOR or, in relation to any Loan made in USD, LIBOR; and
(c) Mandatory Cost, if any.