1. and , Über eine Klasse singulärer Integralgleichungen, Sitz. Berlin Akad. Wiss., 1931, pp. 696–706.
2. and , The Fourier transform in the complex domain, Amer. Math. Soc. Coll. Publication, New York, Vol. XIX, 1934, Chap. IV.
3. Introduction to the Theory of Fourier Integrals. Oxford University Press, Oxford, 1937.
4. Water waves over a channel of infinite depth