1. Ablowitz, M.J., Fokas, A.S.: Complex Variables, Introduction and Applications. Cambridge University Press, Cambridge (1997)
2. Carleman, T.: Sur la résolution de certaines équations intégrales. Ark. Mat. Astr. Fys. 16, 1–19 (1922)
3. Carrier, G.F., Krook, M., Pearson, C.E.: Functions of a Complex Variable. McGraw-Hill Book Company, New York (1966)
4. Case, K.M.: Elementary solutions of the transport equation and their applications. Ann. Phys. (New York) 9, 1–23 (1960)
5. Case, K.M., Zweifel, P.: Linear Transport Theory. Addison-Wesley, Reading, MA (1967)