@Book{KeplerHammerDyckCaspar1939,
author  = "Kepler, Johannes and Hammer, Franz [Hg./Red.] and Dyck, Walther von [Hg./Red.] and Caspar, Max [Hg./Red.]",
title   = "Gesammelte Werke. Astronomiae pars optica",
year    = "1939",
address = "München",
series  = "Kepler. Gesammelte Werke",
volume  = "2",
url     = "https://publikationen.badw.de/de/002334738",
}