@Book{Grigull1996,
author  = "Grigull, Ulrich",
title   = "Sechzig Jahre Kepler-Kommission",
year    = "1996",
address = "München",
series  = "Sitzungsberichte",
volume  = "1996,1",
url     = "https://publikationen.badw.de/de/011300278",
}