The following people have had extended visits in our group:

Yuri Naydjuk, one month 2005
B. Verkin Institute for Low Temperature Physics and Engineering,
National Academy of Sciences of Ukraine

Jan Hoh, several ocasions of several weeks, 2003, 2004 ....
Department of Physiology, Johns Hopkins School of Medcine,  and
Department of Chemical Engineering, Johns Hopkins University, Baltimore, USA

Hidiaka Takanagi, 3 weeks 2003
NTT Basic Reserach Labs, Atsugi, Japan
Frank Hekking, 1 week, 2002
Universite Joseph Fourier, Grenoble, France
Dick Kautz, 2 months 2000 NIST, Boulder, Colorado
Timothy Klemmer,3 weeks 1999 Seagate, Pittsburg, USA
Alexander Sukstanskii, 1998, 1999 several months
PTI, Donetsk, Ukraine