1. MATHEMATICS ENGLISH PROGRAM, FACULTY OF EDUCATION, VALAYA ALONGKORN RAJABHAT UNIVERSITY UNDER THE ROYAL PATRONAGE, KLONG LUANG, PATHUMTHANI, THAILAND
2. DEPARTMENT OF MATHEMATICS, JAMIA MILLIA ISLAMIA, INDIA
3. DEPARTMENT OF MATHEMATICS, JAMIA MILLIA ISLAMIA, INDIA
4. DEPARTMENT OF MATHEMATICS, FACULTY OF SCIENCE, KING MONGKUT'S UNIVERSITY OF TECHNOLOGY THONBURI (KMUTT), BANGKOK, THAILAND
5. SCHOOL OF MATHEMATICS, INSTITUTE OF SCIENCE, SURANAREE UNIVERSITY OF TECHNOLOGY, THAILAND