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2. Jacobsen, L.: Modified approximants for continued fractions. Construction and Applications. Kong. Norske Vid. Selsk. Skr.3, 1?46 (1983)
3. Jacobsen, L.: Domains of functions represented by periodic continued fractions. Kong. Norske Vid. Selsk, Skr. (To appear)
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5. Analytic Theory and Applications Encyclopedia of Mathematics and Its Applications;W.B. Jones,1980