Belgorod State University, Russia.
Polytechnic University of Valencia, Spain.
Texas A&M University, USA.
King Abdulaziz University, Saudi Arabia.
Bulgarian Academy of Sciences, Bulgaria.
PAAET, Al-Ardhyia, Kuwait.
Université de Sidi Bel-Abbès, Algeria.
University of Tuscia, Italy.
Howard University, USA.
Technische Universität Braunschweig, Germany.
Comenius University, Slovakia.
Chelyabinsk State University, Russia.
Moulay Ismail University, Morocco.
Kocaeli University, Turkey.
Universidade de São Paulo, Brazil.
Al Rafidain University College, Iraq.
Universidad de Santiago de Chile, Chile.
Alexandria University, Egypt.
Bialystok University of Technology, Poland.
University of Münster, Germany.
Bharathiar University, India.
University of Peloponnese, Greece.
Freiberg University of Mining and Technology, Germany.
University of Victoria, Canada.
University of Austral, Argentina.
Guizhou University, China.
Moscow State University, Russia.
Xiangtan University, China.