@Book{Nehring1938,
author  = "Nehring, Otto",
title   = "Eine Konstruktion am regelmäßigen 2n-Eck",
year    = "1938",
address = "München",
series  = "Sitzungsberichte",
volume  = "1938,3",
url     = "https://publikationen.badw.de/en/003395925",
}