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2. 3) Werfelman, L.: Side-stepping the Airways, Aero-Safety World, Flight Safety Foundation, Virginia USA, 2007, pp.40-45.
3. U.S. Aviation Regulations Increase Probability of Midair Collisions
4. 5) UK NATS communication to UK Operators, "Don't let SLOP slip on your mind," 2010. (http://www.skybrary.aero/index.php/Strategic_Lateral_Offset)