@Book{Hofmann1868,
author  = "Hofmann, Konrad",
title   = "Zeugnisse über Berthold von Regensburg",
year    = "1868",
address = "",
series  = "Sitzungsberichte",
volume  = "1868,2,4",
url     = "https://publikationen.badw.de/en/003899497",
}