@article{GDZPPN00117309X,
title = {Geometric Convergence of Rational Approximations to e-z in Infinite Sectors.},
journal = {Numerische Mathematik},
volume = {26},
year = {1976},
pages = {211-225},
zbl = {0312.65010},
url = {http://dml.mathdoc.fr/item/GDZPPN00117309X}
}
Saff, E.B.; Varga, R.S.; Ni, W.C. Geometric Convergence of Rational Approximations to e-z in Infinite Sectors.. Numerische Mathematik, Tome 26 (1976) pp. 211-225. http://gdmltest.u-ga.fr/item/GDZPPN00117309X/