1. S.R. Alexander, Results of tests to determine the effect of a conical windshield on the drag of a bluff body at supersonic speeds, NACA RM L6K08a, January, 1947.
2. Experiments on separation of boundary layers on probes in front of blunt-nosed bodies in a supersonic air stream;Mair;Philos. Mag. Ser. 7,1952
3. J.J. Jones, Flow separation from rods ahead of blunt noses at mach number 2.7, NACA RM L52E05a, July, 1952.
4. R.O. Piland, L.W. Putland, Zero-lift drag of several conical and blunt nose shapes obtained in free flight at mach number of 0.7–1.3, NACA RM L54A27, March, 1954.
5. Preliminary investigations of spiked bodies at hyper-sonic speeds;Bogdonoff;J. Aerosp. Sci.,1959