Photoalbum
- With Sergei Goncharov and Stas Bereznuk. Novosibirsk, Russia, 2000.
- With the family of Klaus Ambos-Spies. Heidelberg, Germany, 1994.
- With Gert and Sharlotta Mueller. Heidelberg, Germany, 1993.
- At Reception by German President at Villa Hammersmit. Bonn, Germany, 1993.
- Sy Friedman visiting us at Villa Pontigniano. Siena, Italy, 1994.
- Rome, Italy, 1994.
- Rome, Italy, 1994.
- Barry Cooper, Andrea Sorbi and Dong Ping Yang visiting us at Villa Pontigniano. Siena, Italy, 1994.
- Ruagne, France, 1994.
- Giorgio Odifreddi and Dong Ping Yang visiting us at Villa Pontigniano. Siena, Italy, 1994.
- With Dong Ping Yang. Florence, Italy, 1994.
- With Wolfgang Thomas. Aachen, Germany, 1999.
- With Nikolai Nagornii and his wife (visiting Gert Mueller). Heidelberg, Germany, 1993.
- A talk at the University of Amsterdam, Netherlands, 1999.
- With a monk near Cathedral at Palma de Mallorca, Spain, 2002.
- With Dieter and Maria Spreen. Warum ist es am Rhein so shoen? Bonn-Bad Godesberg, Germany, 2002.
- With Yuri Gurevich and Nikolai Nepeivoda. Novosibirsk, Russia, 2001.
- With Dieter Spreen. Bonn-Bad Godesberg, Germany, 2002.
- El Arenal, Mallorca, Spain, 2002.
- Rome, Italy.
- With Yuri Ershov. Novosibirsk, 2003.
- With Eugeane Asarin. Aachen, Germany, 2007.
- With Sveta, Wuerzburg, Germany, 2006.
- With Participants of the Workshop «Computability and Complexity in Analysis», Schloss Dagstuhl, Germany, 2001
- With Costas Dimitracopuolos and his wife near Posseidon Temple, Athens, Greece, 2006.
- With Yuri Ershov and Bob Soare. Siena, Italy, 2007.
- With Chair of Klaus Wagner. Wuerzburg, Germany, 2007.
- With Klaus Wagner. Wuerzburg, Germany, 2006.
- With Participants of the Workshop «Asian Logic Colloquium», Novosibirsk, Russia, 2005.
- With Luoshan Xu, Siegen, Germany, 2005.
- With Andrey Morozov at a Humboldt Club Meeting, Baikal, Russia, 2005.
- With Anil Nerode. Siena, Italy, 2007.
- With Dana Scott. Siena, Italy, 2007.
- With Margarita Korovina, Maria Spreen, Dieter Spreen and Luoshan Xu at a Chinease restaurant, Koeln, Germany, 2005.
- With Sveta at a Humboldt Meeting, Bikal, Russia, 2005.
- Talk at LATA 2007, Tarragona, Spain, 2007.
- With Sveta at Canarians, Tenerife, Spain, 2006.
- With Sveta at Canarians, Tenerife, Spain, 2006.
- With Bill Wadge, Schloss Dagstuhl, Germany, 2006.
- With Klaus Wagner and his students, in Wuerzburg, Germany, 2004.
- With Ernestina, Wuerzburg, Germany, 2006.
