[1] Knuth, Donald E.: Virtual Fonts: More Fun for Grand Wizards. TUGboat (11) 1990, No 1 (April), pp. 13-23.
[2] Murphy, Timothy: Making virtual fonts with Jiří Zlatuška's 'Accents' program. článek na tex-news z 4. 6. 1993
[3] Zlatuška, Jiří: Automatic generation of virtual fonts with accented letters for TeX. Cahiers GUTenberg No. 10, září 1991