@Book{BiermannGrigull1986,
author  = "Biermann, Ludwig F. B. and Grigull, Ulrich",
title   = "Fünfzig Jahre Kepler-Kommission 50 Jahre Kepler-Kommission",
year    = "1986",
address = "München",
series  = "Sitzungsberichte",
volume  = "1985,3",
url     = "https://publikationen.badw.de/en/003554667",
}