1. V. E. Zuev, V. I. Peresypkin, V. Ya. Fadeev, G. A. Kaloshin, and R. S. Konstantinov, Laser Devices for Navigation Support (Nauka, Novosibirsk, 1985) [in Russian].
2. “Glissada laser landing system”, Sov. J. Quantum Electron. 8 (6), 807 (1978).
3. NAVAIR Lakehurst. Aircraft Platform Interface Laboratory. http://www.navair.navy.mil/.
4. Improved Fresnel Lens Optical Landing System (FLOLS). http://www.tpub.com/content/aviation2/P-1211/P-12110022.htm.
5. Visual approach slope indicator. http://en.wikipedia.org/wiki/Visual_Approach_Slope_Indicator.