1. Some extensions to the method of integration by steepest descents;Clemmow;Quart. J. of Mech. and Appl. Math.,1950
2. A table of for complex values of ρ;Clemmow;Phil. Trans. Roy. Soc. London (A),1953
3. A series of “cut” Bessel functions;Copson;Proc. Edinb. Math. Soc.,1938
4. Theorie und Anwendung der Laplace-Transformation