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2. Disquisitiones generales circa seriem infinitam 1+αβ1·γx+alpha;(α+1)β(β+1)1·2γ(γ+1)xx+ etc, W. Band III;Gauss,1813
3. Applied and Computational Complex Analysis II;Henrici,1974
4. Survey of continued fraction methods of solving moment problems in: Analytic Theory of Continued fractions;Jones,1981