[1] Litz, Bryan 2011. Applied Ballistics For Long Range Shooting. 2nd ed. Cedar Springs, USA: Applied Ballistics, LLC.

[2] Sommer, Simon C. and Stark, James A. 1952 The Effect of Bluntness on the Drag of Spherical-Tipped Truncated Cones of Fitness Ratio 3 at Mach Numbers 1.2 To 7.4 Washington, USA: NACA Research Memorandum A52B13.