1. Atkinson, F. V., A value-region problem occuring in the theory of continued fractions, MRC Technical Summary Report # 419, December 1963, Madison, Wisconsin.
2. Istad, R. M., Om limitområder og strategier for numerisk bestemmelse av dem. Thesis in preparation (Norwegian).
3. Jacobsen, L., Some periodic sequences of circular convergence regions, Lecture Notes in Mathematics, Vol. 932, Springer Verlag, Berlin, Heidelberg, New York 1982, pp. 87–98.
4. Jacobsen, L., Convergence acceleration for continued fractions K(an/1), Transactions of the American Mathematical Society, Vol. 275, Number 1, January 1983.
5. Jacobsen, L., Further results on convergence acceleration for continued fractions K(an/1). Transactions of the American Mathematical Society, Vol. 281, Number 1, January 1984.