@Book{Carathéodory1938,
author  = "Carathéodory, Constantin",
title   = "Bemerkungen zur Axiomatik der Somentheorie",
year    = "1938",
address = "München",
series  = "Sitzungsberichte",
volume  = "1938,13",
url     = "https://publikationen.badw.de/en/003395945",
}