Indices : How-To : Drawing International Characters

Specifics on Diacritics:
Ogonek

See also Characters.

On-line Resources
Character design standards @ Microsoft
Data on Languages @ Institut of Esthonian Language
Diacritics Project. All you need to design a font with correct accents
Gaultney, J. Victor: Problems of diacritic design for Latin script text faces, 2002
Polish Diacritics How To?
Thorn and eth: how to get them right
Wells, J.C.: Orthographic diacritics and multilingual computing
On Diacritics by David Březina