1. Department of Mathematics and Statistics; University of Tromsø - The Arctic University of Norway; N-9037 Tromsø Norway
2. Department of Mathematics and Science; German University of Technology in Oman; Halban Campus, Muscat Sultanate of Oman
3. Centre for Theoretical and Computational Chemistry, Department of Chemistry; University of Tromsø - The Arctic University of Norway; N-9037 Tromsø Norway