@Book{Waerden1955,
author  = "Waerden, Bartel L. van der",
title   = "Eine byzantinische Sonnentafel",
year    = "1955",
address = "München",
series  = "Sitzungsberichte",
volume  = "1954,10",
url     = "https://publikationen.badw.de/de/007277276",
}