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A-4040 LINZ, AUSTRIA E-mail address: dante.kalise@oeaw.ac.at, INSTITUTE AUS- TRIAN ACADEMY OF SCIENCES E-mail address: karl.kunisch@uni-graz, at JOHANN RADON INSTITUTE OF COMPUTATIONAL AND APPLIED MATHEMATICS, AUSTRIAN ACADEMY OF SCI- ENCES ALTENBERGERSTRASSE, vol.36, issue.69 ,