@Book{Bauer1987,
author  = "Bauer, Heinz",
title   = "Mittelwerte und Funktionalgleichungen",
year    = "1987",
address = "München",
series  = "Sitzungsberichte",
volume  = "1986,1",
url     = "https://publikationen.badw.de/de/001126742",
}