1. Ramiza:
Department of Physics, University of agriculture, Faisalabad, Pakistan
2. M. Y. Hussain:
Department of Physics, University of agriculture, Faisalabad, Pakistan
3. M. Rani:
Department of Physics, University of agriculture, Faisalabad, Pakistan
4. Nasim Akhtar:
Department of Physics, University of agriculture, Faisalabad, Pakistan