1. B. L. Ehle,On Padé approximations to the exponential function and A-stable methods for the numerical solution of initial value problems, Thesis 1969, CSRR2010, Department of Computer Science, University of Waterloo, Ontario, Canada, conjecture 3.1. Also see a paper of similar title in SIAM J. Math. Anal. 4 (1973), 671–680.
2. J. W. Daniel and R. E. Moore,Computation and theory in ordinary differential equations, Freeman and Co., 1970, page 80.
3. Y. Genin,An algebraic approach to A-stable linear multistep-multiderivative integration formulas, BIT 14 (1974), 382–406.
4. R. Jeltsch,Note on A-stability of multistep-multiderivative methods, BIT 16 (1976), 74–78.
5. S. P. Nørsett,C-polynomials for rational approximations to the exponential function, Numer. Math. 25 (1975), 39–56.