1. A new representation and inversion theory for the Laplace integral;Hirschman, I. I., Jr.;Duke Math. J.,1948
2. An inversion and representation theory for convolution transforms with totally positive kernels;Hirschman, I. I., Jr.;Proc. Nat. Acad. Sci. U.S.A.,1948
3. The inversion of a general class of convolution transforms;Hirschman, I. I., Jr.;Trans. Amer. Math. Soc.,1949
4. On totally positive functions, Laplace integrals and entire functions of the Laguerre-Polya-Schur type;Schoenberg, I. J.;Proc. Nat. Acad. Sci. U.S.A.,1947
5. E. C. Titchmarsh, Introduction to the theory of Fourier integrals, Oxford University Press, 1937.