@article{NUMA_1976__26_132411,
     author = {E.B. Saff and R.S. Varga and W.C. Ni},
     title = {Geometric {Convergence} of {Rational} {Approximations} to e-z in {Infinite} {Sectors.}},
     journal = {Numerische Mathematik},
     pages = {211--225},
     year = {1976},
     volume = {26},
     zbl = {0312.65010},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1976__26_132411/}
}