| 10/2008-03/2009: | Department of Mathematics, Technical University of Kaiserslautern (TU-KL), Germany (upon invitation by Professor Ralf Korn) |
| 02/2007-09/2007: | Department of Mathematics, Technical University of Kaiserslautern (TU-KL), and the Fraunhofer ITWM, Germany (upon invitation by Professor Ralf Korn in connection with DAAD) |
| 08/2005-09/2005: | Department of Numerical Methods in Mechanical Engineering, Darmstadt University of Technology, Germany (upon invitation by Professor Michael Schaefer) |
| 06/2005-08/2005: | Department of Mathematics, Technical University of Kaiserslautern (TU-KL), and the Fraunhofer ITWM, Germany (upon invitation by Professor Ralf Korn) |
| 08/2004-09/2004: | Department of Numerical Methods in Mechanical Engineering, Darmstadt University of Technology, Germany (upon invitation by Professor Michael Schaefer) |
