web | http://www.scirp.org/journal/PaperInformation.aspx?PaperID=19913#.VRCbRsv5JhE |
author | Hans-Joachim Graubaum, Regina Busch |
publication | Scientific Research |
date | 2012-06-01 |
web | Hans-Joachim Graubaum, Regina ... | Scientific Research | 2012-06-01 |
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