@Book{Haupt1925,
author  = "Haupt, Otto",
title   = "Zur Juelschen Theorie der reellen, ebenen Kurven 4. Ordnung",
year    = "1925",
address = "München",
series  = "Sitzungsberichte",
volume  = "1925,1",
url     = "https://publikationen.badw.de/en/003390835",
}