Decarreau, A.; Dumont-Lepage, M.-C.; Maroni, P.; Robert, A.; and Ronveaux, A. "Formes canoniques des équations confluentes de
l'équation de Heun." Ann. Soc. Sci. de Bruxelles92, 53-78,
1978.Erdélyi, A.; Magnus, W.; Oberhettinger, F.; and Tricomi,
F. G. Higher
Transcendental Functions, Vol. 3. New York: Krieger, pp. 57-62,
1981.Heun, K. "Zur Theorie der Riemann'schen Functionen Zweiter
Ordnung mit Verzweigungspunkten." Math. Ann.33, 161-179, 1889.Ronveaux,
A. (Ed.). Heun's
Differential Equations. Oxford, England: Oxford University Press, 1995.Slavyanov,
S. Yu. and Lay, W. "The Heun Class of Equations." Ch. 3 in Special
Functions: A Unified Theory Based on Singularities. Oxford, England: Oxford
University Press, pp. 97-162, 2000.Valent, G. "An Integral
Transform Involving Heun Functions and a Related Eigenvalue Problem." SIAM
J. Math. Anal.17, 688-703, 1986.Whittaker, E. T. and
Watson, G. N. A
Course in Modern Analysis, 4th ed. Cambridge, England: Cambridge University
Press, p. 576, 1990.Zwillinger, D. Handbook
of Differential Equations, 3rd ed. Boston, MA: Academic Press, p. 123,
1997.