1. 2Smith, D. W. and Walker, J. H. "Skin Friction Measurements in Incompressible Flow," TR R-26,1959, NACA.
2. 5Mabey, D.G., Meier, H.U., and Swayer, W. G. "Some Boundary-Layer Measurements on a Flat Plate at Mach Numbers from 2.5 to 4.5," AGARD CP 93, Paper 2.1,1971.