1. A. Ghalib, K. Saeed, Free space Optical Communications –Theory and Practices (1) p. 1 (2014).
2. E. Leitgeb, S. S. Muhammad, C. Chlestil, M. Gebhart, and U. Birnbacher, “Reliability of FSO links in next generation optical networks,” Proc. 2005 7th Int. Conf. Transparent Opt. Networks, Ict. 2005, vol. 1, pp. 394–401, 2005.
3. N. Khan, A. Ashraf, B. S. Chowdhry, and M. Hashmani, “Survey of challenges in hybrid optical wireless broadband network (HOW-B) for e-health systems,” 2009 Int. Conf. Inf. Commun. Technol. ICICT 2009, pp. 295–299, 2009.
4. F. G. Walther, G. A. Nowak, S. Michael, R. Parenti, J. Roth, J. Taylor, W. Wilcox, R. Murphy, J. Greco, J. Peters, T. Williams, S. Henion, R. Magliocco, T. Miller, and A. Volpicelli, “Air-to-ground lasercom system demonstration,” Proc. - IEEE Mil. Commun. Conf. MILCOM, pp. 1594–1600, 2010.
5. S. Haruyama, H. Urabe, T. Shogenji, S. Ishikawa, M. Hiruta, F. Teraoka, T. Arita, H. Matsubara, and S. Nakagawa, “New ground-to-train high-speed free-space optical communication system with fast handover mechanism,” 2011 Opt. Fiber Commun. Conf. Expo. Natl. Fiber Opt. Eng. Conf., pp. 1–3, 2011.