1. Unité de Dynamique et Structure des Matériaux Moléculaires (UDSMM), Université du Littoral Côte d'Opale
2. 62228 Calais
3. France
4. 59140 Dunkerque
5. Liquid Crystal Research Lab, Department of Physics, University of Lucknow
6. Lucknow 226007
7. India
8. Electron and Ion Microscopy Division, CSIR-National Physical Laboratory
9. New Delhi 110012
10. Department of Physics, Karnatak University
11. Dharwad-580003