@Book{Schönhofer1975,
author  = "Schönhofer, Alfred",
title   = "Ein Minimalproblem der Flächentheorie",
year    = "1975",
address = "München",
series  = "Sitzungsberichte",
volume  = "1974,6",
url     = "https://publikationen.badw.de/en/003384345",
}