1. DEPARTMENT OF MATHEMATICS, SCHOOL OF BASIC AND APPLIED SCIENCES, ADAMAS UNIVERSITY, INDIA.
2. DEPARTMENT OF MATHEMATICS, BABEŞ-BOLYAI UNIVERSITY, CLUJ-NAPOCA, ROMANIA.ACADEMY OF ROMANIAN SCIENTISTS, BUCHAREST, ROMANIA.
3. DEPARTMENT OF MATHEMATICS, NATIONAL INSTITUTE OF TECHNOLOGY DURGAPUR, INDIA.