With Prof. M.Satoh at Tokyo Tech (2009)
New spectroscopy unit of my laboratory: Mr. M.Cuenat (Head of Swiss Mission in Bulgaria), Prof. V.Dimitrov, me, Mr. J.Schenk (Embassy of Germany) and Prof. B.Tchorbanov (2009)
With my students (Agrocultural Faculty, University of Forestry, Sofia, 2005)
With Prof. M.Matsuoka (Kyoto Women's University, 1996)
Ms Nakamura, Dr Kamada, me, Prof. Ohta, Dr Yamada and Dr Ohta (AIST, Kansai Center, Ikeda, 2002)
After the last lecture at University of Forestry (2006)
Me, Prof. G.Perez-Caballero, Dr. T.Stoyanova and Prof. S.Stoyanov (University of Sofia, 1997)
Me, Prof. N.Harada and his team (Sendai, 1996)
In the Laser Lab of Prof. W.Rettig (Humboldt University Berlin, 2004)
Dr. Susumu Kawauchi, me and Prof. Toshir
At Tokyo Tech (1995)
Dr H.Joshi, Prof. C.Gooijer, Dr G. van der Zwan, me and Dr F.Ariese (Vrije Uviversity Amsterdam, 2000)