@Book{Voss1908,
author  = "Voss, Aurel",
title   = "Über Krümmung und konforme Transformation",
year    = "1908",
address = "München",
series  = "Sitzungsberichte",
volume  = "1907,5",
url     = "https://publikationen.badw.de/en/003388842",
}