Dr. Dan CSONTOS (from Mar. 12 to Apr. 13, 2007, Massey University, New Zealand)
Dr. Peter STANO
(from May 1 to May 31, 2008, Research Center for Quantum Information, Slovak Academy of Sciences, SLOVAKIA)
Mr. Nicholas John MAHER (from June 17 to August 9, 2012, University of Michigan, USA)
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