1. Department of Mathematics; JECRC University; Rajasthan Jaipur-303905 India
2. Department of Mathematics; Faculty of Arts and Sciences, Cankaya University; Eskisehir Yolu 29. Km Etimesgut Yukariyurtcu Mahallesi Mimar Sinan Caddesi No: 4 06790 Turkey
3. Institute of Space Sciences; Magurele-Bucharest Romania