@Book{Weier1960,
author  = "Weier, Josef",
title   = "Felder in offenen Riemannschen Mannigfaltigkeiten",
year    = "1960",
address = "München",
series  = "Sitzungsberichte",
volume  = "1959,2",
url     = "https://publikationen.badw.de/de/003384000",
}