Jones, W. B., W. J. Thron, and H. Waadeland. “Value Regions for Continued Fractions $K(a_n 1)$ Whose Elements Lie in Parabolic Regions”. Mathematica Scandinavica 56 (December 1, 1985): 5–14. Accessed July 25, 2026. https://journals.msp.org/mscand/article/view/1539.