1. S. Bergman: Determination of axially symmetric flow patterns of a compressible fluid. J. Math. Physics 29, 133–145 (1950).
2. G. S. S. Ludford: The behavior at infinity of the potential function of the flow of a perfect gas in two dimensions. Report 23a, Nav. Res. Contr. N5ori 76/XVI NR 043 046, Harvard Univ. (1950). — Two notes on the singularities of a compressible flow in the pseudo-logarithmic plane. Report 23b, Nav. Res. Contr. N5ori 76/XVI NR 043 046, Harvard Univ. (1950).
3. G. S. S. Ludford: The behavior at infinity of the potential function of a two-dimensional subsonic compressible flow. Report 23, Nav. Res. Contr. N5ori 76/XVI NR 043 046, Harvard Univ., J. Math. Physics 30, (3), 117–130 (1951).
4. S. Bergman: The hodograph method in the theory of compressible fluids. Supplement to “Fluid Dynamics” by R. v. Mises and K. O. Friedrichs, Brown University (1941/42).
5. S. Bergman: A formula for the stream function of certain flows. Proc. Nat. Acad. Sci., U. S.A. 29, 276–281 (1943).