1. Research Centre of Mathematics, Sri Venkateswara College of Engineering, Sriperumbudur, India
2. Department of Physics, Karpaga Vinayaga College of Engineering and Technology, HWR7 + 7FF, Chengalpattu, Tamil Nadu, India
3. Research Centre for Solar Energy, Department of Physics, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Andhra Pradesh, India