University of Haute Alsace, France
Shaanxi Normal University, China
Cukurova University, Turkey
Chongqing University, China
University of San Andres, Argentina
Curtin University, Malaysia
University of Bejaia, Algeria
Zhejiang University, China
The Polytechnic University of Timisoara, Romania
Iranian Association for Energy Economies & Payame noor University, Iran"
University of New Mexico, Mexico
California Polytechnic State University, USA
Kanazawa University, Japan
Queen Elizabeth Hospital, China
Institute of Mathematical Statistics and Applied Mathematics, Romania.