@Book{Burmester1921,
author  = "Burmester, Ludwig",
title   = "Über den optischen Ausgleich in der Zeitlupe",
year    = "1921",
address = "München",
series  = "Sitzungsberichte",
volume  = "1920,9",
url     = "https://publikationen.badw.de/de/003395459",
}