@Book{Guggenheimer1906,
author  = "Guggenheimer, Siegfried",
title   = "Über die universellen Schwingungen von Systemen von Rotationskörpern",
year    = "1906",
address = "München",
series  = "Sitzungsberichte",
volume  = "1905,12",
url     = "https://publikationen.badw.de/en/003388812",
}