@Book{Grünberger[1785],
author  = "Grünberger, Georg",
title   = "Wittwengesellschaftsberechnungen",
year    = "[1785]",
address = "[München]",
series  = "Abhandlungen",
volume  = "4,[2]",
url     = "https://publikationen.badw.de/de/003392061",
}