Year: 1999.  Visiting Res. Assist.: Wien University, Department of Mineralogy and Petrology, Wien-Austria

Year: 2000.  Visiting Res. Assist.: Heidelberg University, Department of Mineralogy and Petrology, Heidelberg-Germany

Year: 2001.  Visiting Res. Assist.: Heidelberg University, Department of Mineralogy and Petrology, Heidelberg-Germany

Year: 2004.  Visiting Assist. Prof. Dr.: Heidelberg University, Department of Mineralogy and Petrology, Heidelberg-Germany