University of the Free State, South Africa.
Institute of Space Sciences, Romania.
Istanbul Gelisim University, Turkey.
Missouri University of Science and Technology, USA.
University of Napoli "Federico II", Italy.
Universität Stuttgart, Germany.
University of Mazandaran, Iran.
Université de la Rochelle, France.
University of Santiago de Compostela, Spain.
University of Ostrava, Czech Republic.
CAMTP and University of Maribor, Slovenia.
CIDMA and University of Aveiro, Portugal.
Institute of Numerical Mathematics-Moscow, Russia.
China University of Mining and Technology, China.