1. A priori estimates for truncation error of continued fractions K(1/bn);Field;Numer. Math.,1972
2. K.L. Hillam, Some convergence criteria for continued fractions, Ph.D. Thesis, University of Colorado, Boulder, Colorado, 1962.
3. A general convergence criterion for continued fractions K(an/bn);Hillam;Proc. Amer. Math. Soc.,1965
4. W.B. Jones, W.J. Thron, Continued Fractions: Analytic Theory and Applications, Addison-Wesley, Reading, MA, 1980.
5. On a family of twin convergence regions for continued fractions;Lange;Illinois J. Math.,1966