1. Based on notes left by H. Bateman,1953
2. I. S. Gradshtein and I. M. Ryzhik,Tables of Integrals, Series, and Products [in Russian], Gos. Izd. Fiz.-Mat. Lit., Moscow (1962); English transl., Acad. Press, New York (1969).
3. M. Abramovitz and I. A. Stegun,Handbook of Mathematical Functions, Dover, New York (1968).
4. A. Seeger and W. Lay, eds.,Centennial Workshop on Heun's Equation, Max-Plank-Institut für Metalforshung, Stuttgart (1990).
5. A. Erdelyi,Quart. J. Math.,13, 107 (1942).