@article{GDZPPN002485265,
title = {Product Type Bounds on the Approximation of Values of E and G Functions.},
journal = {Monatshefte f\"ur Mathematik},
volume = {102},
year = {1986},
pages = {7-26},
zbl = {0593.10032},
url = {http://dml.mathdoc.fr/item/GDZPPN002485265}
}
Osgood, Charles F. Product Type Bounds on the Approximation of Values of E and G Functions.. Monatshefte für Mathematik, Tome 102 (1986) pp. 7-26. http://gdmltest.u-ga.fr/item/GDZPPN002485265/