- Václav Blažek, "Numerals: Comparative-etymological Analyses of Numeral Systems and Their Implications : Saharan, Nubian, Egyptian, Berber, Kartvelian, Uralic, Altaic and Indo-European Languages", in: Filozofická Fakulta: Opera Universitatis Masarykianae vol. 332, p. 57, Facultas Philosophica - Masarykova Univerzita Brno, 1999 (ردمك 9788021020702)