1. A. M. Borovikov et al., Physics of Clouds (Gidrometeoizdat, Leningrad, 1961) [in Russian].
2. S. M. Shmeter, Thermodynamics and Physics of Convective Clouds (Gidrometeoizdat, Leningrad, 1987) [in Russian].
3. M. C. Blakey, Safety Recommendations, Nat. Transport. Safety Board, Aug. 25, 2006.
4. Flight Operations Technical Bulletin, Boeing Com. Airplanes, April 15, 2011.
5. High Level Ice Crystal Icing: Effects on Engines, www.skydrary.aero/index.php .