Bibliographical references =========================== 1. N. GREFFET: Project OMERSI - Assessment of the time-frequency method in ISS. CR- AMA —06.219 2. G. DEVESA: Application of a dynamic modal condensation method in *Code_Aster* to the study in ISS of the joint resumption of the Time-Frequency method and an alternative strictly temporal method. CR- AMA —08.164