Վահրամ Դումանյան

 “Mathematisches Kollooquium” (Supervisor Prof. Dr. S.Dierolf), Trier University, Germany, 2002: 
 Third International Workshop on Functional Analysis at Trier University, Germany, 2001.
 Scientific Session of the Armenian Mathematical Society, Yerevan, Armenia, 2001.
 Second International Workshop on Functional Analysis at Trier University, Germany, 1997.
 First International Workshop on Functional Analysis at Trier University, Germany, 1994.
 “Oberseminar Funktionalanalysis” (Supervisor Prof. Dr. S.Dierolf), Trier University, Germany, 1991.
 “Oberseminar Funktionalanalysis” (Supervisor Prof. Dr. J. Voigt), Oldenburg University, Oldenburg, Germany, 1991.
 Oberseminar, Saarbrucken University, Saarbrucken, Germany, 1991.