Saint Petersburg, Russia
Texas A&M University, USA
King Abdulaziz University, Saudi Arabia
SPbPU-St. Petersburg, Russia
Institute of Space Sciences, Romania
University of Napoli "Federico II", Italy
Chelyabinsk State University, Russia
Freiberg Univ. of Mining and Technology, Germany
University of Victoria, Canada
University of Aveiro, Portugal
University of La Laguna, Spain
SPbPU-St. Petersburg, Russia
Xiangtan University, China