This Study has been carried out during the 2 nd and 3 rd quarters of 2000 on behalf of the Swiss Defence Procurement Agency in Thun (contract No. 155368). Additional financial and logistic support has been received by the Vrije Universiteit Brussel (VUB) and the École Polytechnique Fédérale de Lausanne (EPFL). 1 The author’s previous affiliation at the EPFL was with the DI–LAMI, which ceased its activities on the 31.8.2000. See also th
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