@Book{Spiegel1855,
author  = "Spiegel, Friedrich von",
title   = "Ueber die irânishe Stammverfassung",
year    = "1855",
address = "München",
series  = "Abhandlungen",
volume  = "7,11 : 3. Abth.",
url     = "https://publikationen.badw.de/de/007458868",
}