1. J.D. Cole Problems in transonic flow, Thesis California Institute of Technology, 1949
2. Flow of a gas in a local supersonic region and some conditions for the break down of potential flow.;Nikolski,1948
3. The problem of drag at high subsonic speeds, Translation 184;Busemann,1947
4. G. Guderley Considerations on the structure of transonic flow patterns, Wright Field report F-TR-2168-ND.
5. Introduction to Aerodynamics of a Compressible Fluid;Liepmann,1947