[Inkscape-user] Problem displaying unicode characters from eps file.

Inkscape 0.46 Linux Ubuntu

I have prepared a diagram using unicode characters (Greek). When I save this diagram as eps, Inkscape displays the correct Greek characters. However, when I import the eps file into non-Inkscape documents, or just display the file with an application other than Inkscape, the characters display as English characters. For example, Delta displays as r4 and lambda displays as w. Can someone tell me how to fix this problem? regards, Roger