1. Oliver, J.: The numerical solution of linear recurrence relations. Numer. Math.11, 349?360 (1968)
2. Olver, F. W. J.: Numerical solution of second order linear difference equations. J. Res. N.B.S.71B, 111?129 (1967)
3. Ortega, J. M., Rheinboldt, W. C.: Iterative solution of nonlinear equations in severable variables. New York-London: Academic Press 1970