Não informado. (2001). Review. Bulgarian Geological Society.
Lua i Stíl Chicago (17ú heag.)Não informado. Review. Sofia: Bulgarian Geological Society, 2001.
Lua MLA (8ú heag.)Não informado. Review. Bulgarian Geological Society, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.