1. Bergman, S.: Zur Theorie der Funktionen, die eine lineare partielle Differentialgleichung befriedigen, Mat. Sb. (2) 44 (1937), 1169–1198.
2. Bergman, S.: Integral Operators in the Theory of Partial Differential Equations, Third Printing, Vol. 23, Ergebnisse der Mathematik und ihrer Grenzgebiete, Springer-Verlag Berlin, Heidelberg, New York, 1971.
3. Bergman, S.: Two-dimensional subsonic flows of a compressible fluid and their singularities, Trans. Amer. Math. Soc. 62 (1947), 452–498.
4. Bergman, S.: Two-dimensional transonic flow patterns, Amer. J. Math. 70 (1948), 856–891.
5. Bergman, S.: On solutions of linear partial differential equations of mixed type, Amer. J. Math. 74 (1952), 444–474.