@Book{Petzet1904,
author  = "Petzet, Erich",
title   = "Über das Heidelberger Bruchstück des Jüngeren Titurel",
year    = "1904",
address = "München",
series  = "Sitzungsberichte",
volume  = "1903,6",
url     = "https://publikationen.badw.de/en/007457693",
}