@Book{KeplerDyckCaspar1927,
author  = "Kepler, Johannes and Dyck, Walther von [Sonst.] and Caspar, Max [Sonst.]",
title   = "Die Keplerbriefe auf der Nationalbibliothek und auf der Sternwarte in Paris",
year    = "1927",
address = "München",
series  = "Abhandlungen",
volume  = "31,1",
url     = "https://publikationen.badw.de/en/003071295",
}