@Book{Messerschmitt1907,
author  = "Messerschmitt, Johann Baptist",
title   = "Magnetische Ortsbestimmungen in Bayern",
year    = "1907",
address = "München",
series  = "Sitzungsberichte",
volume  = "1906,15",
url     = "https://publikationen.badw.de/de/003898179",
}