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@article{MZ_1960__73_169849, author = {W.J. Thron and L.J. Lange}, title = {A two-parameter family of best twin convergence regions for continued fractions.}, journal = {Mathematische Zeitschrift}, pages = {295--311}, publisher = {mathdoc}, volume = {73}, year = {1960}, zbl = {0094.26701}, url = {http://geodesic.mathdoc.fr/item/MZ_1960__73_169849/} }
W.J. Thron; L.J. Lange. A two-parameter family of best twin convergence regions for continued fractions.. Mathematische Zeitschrift, Tome 73 (1960), pp. 295-311. http://geodesic.mathdoc.fr/item/MZ_1960__73_169849/