@article{MOMA_1986__102_178286,
     author = {Charles F. Osgood},
     title = {Product {Type} {Bounds} on the {Approximation} of {Values} of {E} and {G} {Functions.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {7--26},
     publisher = {mathdoc},
     volume = {102},
     year = {1986},
     zbl = {0593.10032},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1986__102_178286/}
}