Enstad, G. G. (1981). A novel theory on the arching and doming in mass flow hoppers. Norges Teknisks Høgskole.
Lua i Stíl Chicago (17ú heag.)Enstad, Gisle G. A Novel Theory on the Arching and Doming in Mass Flow Hoppers. Bergen, Norway: Norges Teknisks Høgskole, 1981.
Lua MLA (8ú heag.)Enstad, Gisle G. A Novel Theory on the Arching and Doming in Mass Flow Hoppers. Norges Teknisks Høgskole, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.