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2. Mogil’nikov, N.V., Gorbunov, V.V., and Levitskii, L.F., Dvizhenie snaryada v stvole i na traektorii (Shell Motion in Barrel and along the Trajectory), Tula: TulGU, 2002.
3. Potapov, A.A., Iskusstvo snaipera (Sniper’s Art), Moscow: Fair-Press, 2003.Fig. 2.