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First publ. in: Applied Physics Letters 85 (2004), 23, pp. 5637-5639
Konstanzer Online-Publikations-System (KOPS) URN: http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-126367
URL: http://kops.ub.uni-konstanz.de/volltexte/2011/12636
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