@Book{Haupt1978,
author  = "Haupt, Otto",
title   = "Differenzierbare ordnungshomogene Bogen im Rn",
year    = "1978",
address = "München",
series  = "Sitzungsberichte",
volume  = "1977,12",
url     = "https://publikationen.badw.de/de/003384291",
}