@Book{Perron1933,
author  = "Perron, Oskar",
title   = "Eine neue Winkeldreiteilung des Schneidermeisters Kopf",
year    = "1933",
address = "München",
series  = "Sitzungsberichte",
volume  = "1933,24",
url     = "https://publikationen.badw.de/de/003383427",
}