Não informado. (1990). Optics & Photonics News. Optical Society of America.
Lua i Stíl Chicago (17ú heag.)Não informado. Optics & Photonics News. Washington: Optical Society of America, 1990.
Lua MLA (8ú heag.)Não informado. Optics & Photonics News. Optical Society of America, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.