Winter semester 2007/8:
Albert Demeter, Cluj, 7/07 to 12/07.

Summer semester 2007:
Prof Dr Changchang Xi, Beijing Normal University (Bessel prize of the Humboldt foundation), 09/06 to 08/07
Prof Dr Osamu Iyama,Nagoya University (7/2007)
Dr Hiroshi Nagase, Nara National College of Technology (8/2007)
Prof Dr Gus Lehrer, University of Sydney (5/2007 and in 2008)
Albert Demeter, Cluj, 7/07 to 12/07.

Winter semester 2006/7:
Prof Dr Changchang Xi, Beijing Normal University (Bessel prize of the Humboldt foundation), 09/06 to 08/07
Prof Dr Libin Li, Yangzhou University (2-3/2007)

Summer semester 2006:
Dr Luca Diracca, University of Padova, (5-6/2006)

Winter semester 2005/6:
Dr Ronghua Tan (2-3/2006), Hubei Institute for Nationalities, Enshi
Dr Ming Fang , University of Science and Technology of China, Hefei / Chinese Academy of Sciences (2-3/2006)
Dr Qunhua Liu, Tsinghua University, Beijing (2-3/2006)
Dr Dong Yang, Tsinghua University, Beijing (2-3/2006)
Prof.Dr Bin Zhu, Tsinghua University, Beijing (1-3/2006)