“Gheorghe Mihoc-Caius Iacob” Institute of Mathematical Statistics and Applied Mathematics of Romanian Academy, Romania.
Laboratory of Mathematics Raphaël Salem, France.
“Costin C. Kiritescu” National Institute of Economic Research of Romanian Academy, Romania.
University of Rouen – Normandy, France.
French National Centre for Scientific Research, France.
Fédération Normandie-Mathématiques, France.