... Technology¹

FB 04, AG 9, Schlossgartenstr. 7, 64289 Darmstadt, Germany. Tel.: +49 6151 163087; Fax: +49 6151 166822; E-mail address: tfischer@mathematik.tu-darmstadt.de. The author gratefully acknowledges funding by the German Federal Ministry of Education and Research (BMBF, 03LEM6DA).

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... GmbH²

Hauser Muehlberg 21, 93444 Koetzting, Germany. Tel.: +49 170 1639874; E-mail address: aroehrl@approximity.com. The authors thank Angelika May for ongoing support.

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