1. G.S.S. Ludford, “The behavior at infinity of the potential function of a two-dimensional subsonic compressible flow”, J. Math. & Phys. XXX, No. 3., p. 117, 1951.
2. G.S.S. Ludford, “The classification of one-dimensional flows and the general shock problem of a compressible, viscous, heat-conducting fluid”, J. Aero. Sci. 18, No. 12, p. 830, 1951.
3. G.S.S. Ludford, “The boundary layer nature of shock transition in a real fluid”, Quart. Appl. Math. X, No. 1, p. 1, 1952.
4. G.S.S. Ludford, “On an extension of Riemann’s method of integration, with applications to one-dimensional gas dynamics”, Proc. Cambr. Phil. Soc. 48, p. 499, 1952.
5. G.S.S. Ludford, “Extensions on the applicability of Riemann’s formula”, J. Rat. Mech. and Anal. 3, No. 1, p. 77, 1954.