1. Numerical continued fractions;Bankier, J. D.;Amer. J. Math.,1942
2. George Copp, Some convergence regions for a continued fraction, Dissertation, Univ. of Texas, Austin, 1950.
3. Twin convergence regions for continued fractions;Cowling, V. F.;Bull. Amer. Math. Soc.,1944
4. On the convergence of a continued fraction;Glass, T. F.;Bull. Amer. Math. Soc.,1943
5. Truncation error estimates for Stieltjes fractions;Henrici, Peter;Numer. Math.,1966