@Book{KeplerCaspar1932,
author  = "Kepler, Johannes and Caspar, Max [Sonst.]",
title   = "Joh. Kepleri notae ad epistolam D.D. M. Hafenrefferi",
year    = "1932",
address = "München",
series  = "Abhandlungen",
volume  = "N.F., 14",
url     = "https://publikationen.badw.de/en/005713411",
}