@Book{Perron1952,
author  = "Perron, Oskar",
title   = "Beweis des Moessnerschen Satzes",
year    = "1952",
address = "München",
series  = "Sitzungsberichte",
volume  = "1951,4",
url     = "https://publikationen.badw.de/en/043542577",
}