Because of the attack on the computer network of the University of Duisburg-Essen, some content (in particular some image files) cannot be accessed because it is stored on central servers of the university.

Dr. Leonid Ryvkin

Former member at ESAGA

Email: leonid.ryvkin - at -

Personal website

Supported by the DAAD P.R.I.M.E. program, Dr. Ryvkin is currently in Paris.