References
- Grundlagen fur eine Allgemeine, Theorie der Functionen einer veranderlichen complexen Grosse, in Werke, pp. 3-43.
- R. G. Bartle & D. R. Sherbert, Introduction to Real Analysis, John Wiley & Sons, Inc., 1992.
- G. F. Simmons, Differential Equations with Applications and Historical Notes, McGraw-Hill, New York, 1991.
- D. E. Smith, A source Book in Mathematics, McGraw-Hill, New York, 1929.
- E. D. Rainville, Intermediate Differential Equations, Macmillan, New York, 1964.
- E. C. Titchmarsh, The Theory of Riemann Zeta Function, Oxford University Press, London, 1951.