@Book{Donner1977,
author  = "Donner, Klaus",
title   = "Extremalpunktmethoden für geordnete Algebren",
year    = "1977",
address = "München",
series  = "Sitzungsberichte",
volume  = "1976,5",
url     = "https://publikationen.badw.de/en/003384265",
}