@Book{Spiegel1861,
author  = "Spiegel, Friedrich von",
title   = "Der Gebrauch des Dualis im Altbaktrischen",
year    = "1861",
address = "München",
series  = "Sitzungsberichte",
volume  = "1861,2,12",
url     = "https://publikationen.badw.de/de/003399849",
}