@article{MZ_1958__69_169732,
     author = {W.J. Thron},
     title = {On {Parabolic} {Convergence} {Regions} for {Continued} {Fractions.}},
     journal = {Mathematische Zeitschrift},
     pages = {173--182},
     publisher = {mathdoc},
     volume = {69},
     year = {1958},
     zbl = {0081.05704},
     url = {http://geodesic.mathdoc.fr/item/MZ_1958__69_169732/}
}