Prof B Emmanuel, Institute of Curie, Paris, France During FPGG Fellow 09/2013-08/2014
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Prof Stefan Huber in Technical University Munich Germany during Humboldt Fellow 06/2012- 08/2013
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Prof C- G. Zhao in University of Sanantonio Texas USA 6/2010-05/2011
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Prof Andrew M Harned in Univesity of Minnesotta USA 04/2008 -05/2010
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