@Book{Schlögl1955,
author  = "Schlögl, Elmar",
title   = "Über besondere Bewegungsformen des mathematischen Pendels",
year    = "1955",
address = "München",
series  = "Sitzungsberichte",
volume  = "1954,4",
url     = "https://publikationen.badw.de/de/003383786",
}