| Institution: | 1. Department of Mathematics, College of Education, Salahaddin University-Erbil, Erbil, Kurdistan Region, Iraq;2. School of Mathematics, University of Bristol, Fry Building, Woodland Road, Bristol, BS8 1UG, UK;3. the Heilbronn Institute for Mathematical Research, Bristol, UK;4. School of Mathematics, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK;1. Departamento de Matemáticas, Universidad de León, Spain;2. Departamento de Matemáticas, Universidad de Salamanca, Spain;1. DGA MI, France;2. Université libre de Bruxelles, Département d''informatique, Belgium;3. University of Birmingham, School of Computer Science, United Kingdom;1. Department of Mathematics, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, PR China;2. State Key Laboratory of Cryptology, P. O. Box 5159, Beijing, 100878, PR China;3. Department of Mathematics, Ewha Womans University, Seoul, 03760, South Korea |
