@Book{Perron1954,
author  = "Perron, Oskar",
title   = "Die Preece'schen Kettenbrüche",
year    = "1954",
address = "München",
series  = "Sitzungsberichte",
volume  = "1953,3",
url     = "https://publikationen.badw.de/de/003383728",
}