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0075-8442 ll be found in Volume 105. Besides the Principal Lecturers there were three Guest Lecturers: M.C. Delfour, V. Jurdjevic and S.P. Sethi, who presented substantia978-3-540-07026-9978-3-642-48290-8Series ISSN 0075-8442 Series E-ISSN 2196-9957