1. Kedar, D., Arnon, S. (2004). Urban optical wireless communication networks: The main challenges and possible solutions. IEEE, Communications Magazine, 42(5), S2–S7.
2. Malik, A., & Singh, P. (2015). Free space optics: Current applications and future challenges. International Journal of Optics, 2015(7), Article ID 945483.
3. Willebrand, H. A., & Ghuman, B. S. (2001). Fiber optics without fiber. IEEE Spectrum, 38(8), 40–45.
4. Ali, M., & Ali, A. (2013). Atmospheric turbulence effect on free space optical communication. International Journal of Emerging Technologies in Computational and Applied Sciences.
5. Zhu, X., & Kahn, M. J. (2002). Free-space optical communication through atmospheric turbulence channels. IEEE Transactions on Communication,
50(8), 1233–1239.