Does anyone know any source in which I could find a recurrence relation for the coefficients of the series solution of the Confluent Heun Equation


$$y''+\left( {\gamma\over z}+{\delta\over z-1}+\varepsilon\right)y'+{\alpha z-q\over z(z-1)}y=0$$


around the regular singular point $z=0$?



Confluent Heun Equation
A good place to start looking would be the book "Heun's Differential Equations" by A. Ronveaux.


