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2. H. S. Wall: Analytic Theory of Continued Fractions (Van Nostrand, Princeton 1948)
3. A. N. Khovanskii: The Application of Continued Fractions and Their Generalizations to Problems in Approximation Theory (Noordhoff, Groningen 1963)
4. A. Y. Khinchin: Continued Fractions (University of Chicago Press, Chicago 1964)
5. F.D.M. Haddani: Phys. Rev. Lett. 51, 605–607 (1983)